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New Hampshire Department of Environmental Services
PUBLIC GOVERNMENT BUSINESS A to Z LIST

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Angle Pond dam is located at the south/east end of the lake in Sandown.
 
The following parameter is currently
being measured at this site:

Angle Pond Stage (Lake Elevation)


Summer Operations
Water level is maintained at full pond. Full pond equals 
top of spillway at the dam.


Seasonal Fall Drawdown
There is a short drawdown season; the lake level is dropped 
by two feet from Columbus day to December 1st.
Then all stoplogs are put back in the dam.


Spring Refill
Water level rises gradually over the winter months after stoplogs
are replaced. 
Full pond is usually achieved just before ice out on pond.



Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. 
Target water levels are maintained by the adjustment of flows at 
the dam in response to these conditions.
This station is located on the Squam River adjacent to US route 3 and 
just downstream of the Squam Lake Dam.  The following parameter is
currently being measured at this station:

Squam River Stage / Flow


Information related to the water level of Squam Lake may be found
by returning to the map interface and clicking on the Squam Lake
link. 
Barnstead Parade dam is located on the Suncook river at 
Barnstead Parade, in Barnstead.
 
The following parameter is currently
being measured at this site:

Barnstead Lake Stage (Lake Elevation


Summer Operations
Lake level is maintained at full pond. Full pond is equal to top 
of flashboards at the dam.


Seasonal Fall Drawdown
Drawdown begins after Columbus Day. Lake is lowered by 
one and a half feet. This is done by operation of the gate and 
stoplogs at the dam. 
Flashboards are also removed from the spillway when water 
flows allow them to be removed.


Spring Refill
Lake is refilled after spring runoff when the flows from 
snow melt allow it.



Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
						

LOCATION
Tamworth, NH
Latitude 43°49'48", Longitude 71°17'18" NAD27
Adjacent to NH route 25 approximately 3 miles east of the
Sandwich/Tamworth border.
Carroll County, New Hampshire , Hydrologic Unit 01060002
 
DRAINAGE AREA
67.6 square miles.  

GAGE
Datum of gage is 490 feet above sea level NGVD29.
 
SITE TYPE
Bearcamp River Stage / Flow
Precipitation

OPERATION 
Record for this site is maintained by the USGS office in New Hampshire.

More information may be obtained from the USGS by using the link at the
top of this page.

Note:  This gage measures runoff from approximately 20 percent of the
total contributing watershed for Ossipee Lake as measured at the dam.
Generally, multiplyng the flow at this site by a factor of 5 will
approximate the total inflow to the Ossipee Lake system.
LOCATION
Bristol, NH
Latitude 43°33'59", Longitude 71°44'54" NAD27
This station is located on the Smith River*, which forms the 
border between Bristol and Hill, NH, and is adjacent to Smith River 
Road and 0.5 miles east of Route 3A.
Merrimack County, New Hampshire , Hydrologic Unit 01070001 

DRAINAGE AREA 
85.80 square miles.

GAGE
Datum of gage is 449.80 feet above sea level NGVD29.

SITE TYPE
Smith River Stage / Flow

OPERATION 
Record for this site is maintained by the USGS office in New Hampshire.

More information may be obtained from the USGS by using the link at the
top of this page.


*Although the Smith River is located outside of both the Winnipesaukee
and Newfound River watersheds, the data collected at this unregulated 
(no man-made obstructions/dams) site has proven to be a relatively 
accurate indicator of the response of both to conditions related to
rainfall and snowmelt. 
Buck Street West dam is located on the Suncook river, 
which is located just off RTE. 28 in Pembroke. 

The following parameter is currently
being measured at this site:

Buck Street Lake Stage (Lake Elevation)


Summer Operations
Water level is maintained at full pond. Full pond is equal to top 
of spillway at the west side dam.


Seasonal Fall Drawdown
Drawdown begins on or just after Columbus day. This is done by operations 
of gates and stoplogs at the dam.


Spring Refill
The gates are reclosed after the spring runoff season to refill the river.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.

Crystal Lake dam is located at the north end of the lake in Enfield.

The following parameter is currently
being measured at this site:

Crystal Lake Stage (Lake Elevation)


Summer Operations
Lake is maintained at full pond. Full pond is 8.0 on local gauge at dam, 
or top of flashboards at the dam.


Seasonal Fall Drawdown
Stop logs at dam are removed after Columbus day. 
Normal drawdown reaches 4’ below full lake level.


Spring Refill
After winter ice out or, around Mid April, pond is refilled.
 
Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.





Crystal Lake dam is located at the south end of the lake in Gilmanton.

The following parameter is currently
being measured at this site:

Crystal Lake Stage (Lake Elevation)


Summer Operations
Lake level is maintained at full pond. Full pond is equal to top 
of the spillway at the dam.


Seasonal Fall Drawdown
Stoplogs holding back water in lake are removed after Columbus day.
The lake is normally lowered towards a goal of 3’.
During most years, the 3' drawdown is not reached.


Spring Refill
Lake is allowed to return to full pond after ice out, 
usually in Mid-April. This is done by replacing stoplogs at the dam.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
LOCATION:
Concord, NH 
Latitude 43°12'32", Longitude 71°31'51" NAD27
At the Loudon Road Bridge, adjacent to I-93, Exit 14.
Merrimack County, New Hampshire , Hydrologic Unit 01070002 

DRAINAGE AREA: 
2,300.00 square miles.

GAGE:
Datum of gage is 225 feet above sea level NGVD29.

SITE TYPE:
Merrimack River Stage

OPERATION: 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link at the
top of this page.
Kingswood Lake dam is located at the south/east end of 
the lake in Brookfield.

The following parameter is currently
being measured at this site:

Kinswood Lake Stage (Lake Elevation)


Summer Operations
Lake level is maintained at full pond. Full pond is equal to zero on 
local gauge at dam, or top of logs at dam.


Seasonal Fall Drawdrawn
Drawdown of lake begins around Columbus day. 
Stoplogs are removed from dam, slowly, to try and achieve a 
four foot drawdown. In most years the full four foot drawdown is not met. 
Three to three and a half feet drawdown is the usual target level.


Spring Refill
Most of the stop logs are put back in the dam at the begining of 
the new year. 
Lake will slowly refill over winter months to reach full pond.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
Deering Reservoir dam is located at the north/west end of 
the lake in Deering.

The following parameter is currently
being measured at this site:

Deering Lake Stage (Lake Elevation)


Summer Operations
Water level is maintained at full pond. Full pond level is equal to 
the top of the flashboards at the dam.


Seasonal Fall Drawdown
After Columbus Day the reservoir level is lowered by one 
foot untill November 1st. 
Then the lake is lowered three more feet to 
achieve a four foot drawdown.


Spring Refill
Stoplogs are put back in the dam through spring runoff to 
reach full pond when ice is out.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
LOCATION:
Brentwood, NH
Latitude 42°59'04", Longitude 71°02'20" NAD27
Adjacent to the Haigh Road bridge, approximately 0.4 miles south of NH
route 111A.
Rockingham County, New Hampshire , Hydrologic Unit 01060003
 
DRAINAGE AREA: 
63.5 square miles

GAGE:
Datum of gage is 60.16 feet above sea level NGVD29.

SITE TYPE:
Exeter River Stage / Flow
Precipitation
Air Temperature

OPERATION: 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link at the
top of this page.
This station is located at the Franklin Falls Dam on the Pemigewasset River,
just upstream of the confluence of the Pemigewasset and Winnipesaukee Rivers
in Franklin. The following parameters are currently being measured at this station:

Franklin Falls Reservoir Stage (Reservoir Elevation)
Precipitation
Air Temperature


More information about this site may be obtained by clicking on the link below:


http://www.nae.usace.army.mil/recreati/ffd/ffdhome.htm

LOCATION 
Franklin, NH
Latitude 43°25'22", Longitude 71°39'12" NAD27
This station is located on the Merrimack River,just below the
confluence of the Pemigewasset and Winnipesaukee Rivers.
Merrimack County, New Hampshire , Hydrologic Unit 01070002 

DRAINAGE AREA 
1,507.00 square miles.

GAGE
Datum of gage is 250.40 feet above sea level NGVD29.

SITE TYPE
Merrimack River Stage / Flow

OPERATION 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link
at the top of this page.
Great East Lake dam is located at the south/east end of the lake on the 
NH/ME border in Wakefield.

The following parameter is currently
being measured at this site:

Great East Lake Stage (Lake Elevation)
Precipitation,air temperature and humidity.
Note: Precipitation is not recorded in the winter months from
October to April.


Summer Operations
Lake level is maintained at full pond. Full pond is equal to 
the top of the spillway elevation at the dam.


Seasonal Fall Drawdown
The lake level is gradually lowered by operations of the gate at the dam. 
These operations start at the begining of October of every year. 
The lake is lowered to three feet below full pond level.

									
Spring Refill
Lake is refilled during spring runoff, and full pond is achieved 
after ice out.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.

LOCATION:
Goffstown, NH 
Latitude 43°01'00", Longitude 71°33'04" NAD27
Approximately 1 mile downstream of Gregg Falls Dam.
Hillsborough County, New Hampshire , Hydrologic Unit 01070002

DRAINAGE AREA: 
202.00 square miles.

GAGE:
Datum of gage is 175.00 feet above sea level NGVD29.

SITE TYPE:
Piscataquog River Stage / Flow

OPERATION: 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link at the
top of this page.
Station no longer in operation.

This station is located at the Gilmanton Transfer Facility on Route 107,
approximately 1.5 miles north of the intersection with Route 140.
 
The following parameters are currently being measured at this station:

Precipitation
Air Temperature
LOCATION:
Manchester, NH
Latitude 42°56'53", Longitude 71°27'50" NAD27
Approximately 3 miles downstream of the confluence with the Piscataquog
River.
Hillsborough County, New Hampshire , Hydrologic Unit 01070002
 
DRAINAGE AREA: 
3,092.00 square miles.

GAGE:
Datum of gage is 109.27 feet above sea level NGVD29.

SITE TYPE:
Merrimack River Stage / Flow

OPERATION: 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link at the
top of this page.
Goose Pond dam is located at the south end of the lake in Canaan.

The following parameter is currently
being measured at this site:

Goose Pond Stage (Lake Elevation) and water temperature.


Summer Operations
Lake is maintained at full pond (19.5). Full Pond is 19.50 on 
local gauge, or top of upstream front spillway


Seasonal Fall Drawdown
Drawdown of lake is started on or close to Columbus day.
Lake is lowered by 7.5 ft. below full pond (to 12.0 at local gauge). 


Spring Refill
Gate or gates are closed down to fish flow in late January or 
early February. 
Lake is allowed to fill to 19.5 on local gauge after ice out.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
 





Grafton Pond dam is located at the west end of the lake in Grafton, 
on the Enfield town line.

The following parameter is currently
being measured at this site:

Grafton Pond Stage (Lake Elevation)


Summer Opereations
Lake level is maintained at full pond. Full Pond level is equal to 
16.0 feet on the local gauge, or the top of the spillway at the dam.


Seasonal Fall Drawdown
At this time there is a two foot drawdown.
This is still under evaluation by DES. 
Drawdown levels could change in the future.


Spring Refill
Gates are used to limit outflow to fill pond after ice out, in Mid April.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
Great Pond dam is located at the south end of the lake in Kingston.

The following parameter is currently
being measured at this site:

Great Pond Stage (Lake Elevation)


Summer Operations
Water level is maintained at full pond. Full pond eqauls zero 
on local gauge.


Seasonal Fall Drawdown
Lake level is dropped one foot by removing stoplogs from dam, 
after Columbus day.
In most years the one foot draw down is not achieved due to 
the water hydrology of the downstream flows.


Spring Refill
Stoplogs are put in after spring runoff to achieve full pond.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.

LOCATION: 
Henniker, NH
Latitude 43°09'07", Longitude 71°51'28" NAD27
Approximately 1 mile east of the border between Hillsborough and
Henniker.
Merrimack County, New Hampshire , Hydrologic Unit 01070003
 
DRAINAGE AREA: 
368.00 square miles.

GAGE:
Datum of gage is 480.00 feet above sea level NGVD29.

SITE TYPE:
Contoocook River Stage / Flow

OPERATION: 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link at the
top of this page.
Highland Lake Dam is located at the southern tip of Highland Lake in Stoddard,
approximately 1/4 mile up Shedd Hill Rd. off of Rt. 123.

The following parameters are currently being measured at this site:

Highland Lake Stage (Lake Elevation)
Precipitation
Air Temperature

Summer Operations
The lake level is maintained as close to the full summer recreation level as
possible, as meteorological conditions and minimum flow requirements allow.
Full summer recreation level is 0 on the gage at Highland Lake Dam, which
corresponds to an elevation of 1294.60.

Seasonal Fall Drawdown
Drawdown begins on or near Columbus Day.  The lake is drawn down 3 feet
(elev. 1291.60) below the summer recreation level, and full drawdown is 
generally reached by November or December in most years. The drawdown is
accomplished by removing flashboards and pulling stoplogs at the dam.

Spring Refill
Lake is refilled to the full summer recreation level between March and June
1st as the snowpack melts and spring rains occur.   

Operations at Highland Lake Dam must be coordinated with Island Pond Dam downstream in order to match flows and avoid flooding/draining of either of the impoundments.  

Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
Horace Lake dam is located at the north/east end of the lake in Weare.

The following parameter is currently
being measured at this site:

Horace Lake Stage (Lake Elevation), precipitation, temperature,
and humidity. Note: Precipitation is not recorded for the winter 
months from October to April.


Summer Operations
Water level is maintained at full pond. Full Pond is equal to the 0.0 mark
on the staff gauge at the dam, or equal to the top of the spillway.


Seasonal Fall Drawdown
The lake is lowered beginning the weekend after Columbus Day, 
gradually drawn down to five feet. 


Spring Refill
Refilling starts about May 1st. The refill is completed 
no earlier than May 15.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
Horn Pond dam is located at the south end of the lake in Wakefield,
on the NH/ME border.

The following parameter is currently
being measured at this site:

Horn Pond Stage (Lake Elevation)


Summer Operations
Water level is maintained at full pond. Full pond is equal to zero on 
local gauge at the dam, or, top of stoplogs at the dam.


Seasonal Fall Drawdown
The lake level is gradually lowered after Columbus day to one and 
a half feet below full pond level. 
This is done by removal of stoplogs at the dam.


Spring Refill
Lake is refilled after spring runoff, after ice out.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.

Island Pond Dam is located at the southern end of Island Pond in Stoddard,
approximately 1/4 mile up Treelyn Rd. off of Rt. 123 to Deer Run Rd.

The following parameters are currently being measured at this site:

Island Pond Stage (Lake Elevation)


Summer Operations
The lake level is maintained as close to the full summer recreation level as
possible, as meteorological conditions and minimum flow requirements allow.
Full summer recreation level is 0 on the gage at Island Pond Dam, which
corresponds to an elevation of 1281.63.

Seasonal Fall Drawdown
Drawdown begins on or near Columbus Day.  The lake is drawn down 3 feet
(elev. 12978.63) below the summer recreation level, and full drawdown is 
generally reached by November or December in most years. The drawdown is
accomplished by pulling stoplogs and opening gate at the dam.

Spring Refill
Lake is refilled to the full summer recreation level between March and June
1st as the snowpack melts and spring rains occur. 

Operations at Island Pond Dam must be coordinated with Highland Lake Dam upstream in order to match flows and avoid flooding/draining of either of the impoundments.  


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
The information on this page is intended provide users with the most current operations
information for Newfound, Squam and Ossipee lakes.  For specific information about operations
and the current water levels and discharges at these locations, return to the map interface
and select the appropriate link.



Friday April 21st, 5 AM readings


____________________________________________________________________________________
  

Newfound Lake


The level of Newfound Lake is 5.30. Discharge from the dam is 106 cfs. Flow will be 
reduced to 80 cfs today.

_____________________________________________________________________________________


Squam Lake

The level of Squam Lake is 562.21. Discharge is 120 cfs. Flow will be reduced to 75 cfs
today.


_____________________________________________________________________________________


Ossipee Lake

The lake level at Ossipee Lake is reading 405.78. The release rate is 863 cfs. The dam
stoplogs will be installed next week, and the gates partiallyclosed to start raising the 
lake level.


_____________________________________________________________________________________




This message will be updated as necessary when operational changes are planned or
implemented, otherwise the information should be considered representative of current
conditions at each location. DES will update this web page if any adjustments to flows 
at any of the locations noted above are made.


LOCATION: 
Durham, NH
Latitude 43°06'09", Longitude 70°57'11" NAD27
Adjacent to the Packers Falls Road bridge.
Rockingham County, New Hampshire , Hydrologic Unit 01060003 

DRAINAGE AREA:
183.00 square miles.

GAGE:
Datum of gage is 38.28 feet above sea level NGVD29.

SITE TYPE:
Lamprey River Stage / Flow

OPERATION: 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link at the
top of this page.
LOCATION
Lincoln, NH
Latitude 44°02'51", Longitude 71°39'37" NAD27
Approximately 1.5 miles east of the intersection of I-93 and NH route 112.
Grafton County, New Hampshire , Hydrologic Unit 01070001 

DRAINAGE AREA
115 square miles.

GAGE
Datum of gage is 830 feet above sea level NGVD29. 

SITE TYPE
Pemigewasset River Stage / Flow 

OPERATION 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link at the
top of this page.

This station is located just upstream of the Elm Street Bridge in Lakeport.  The following
parameters are currently being measured at this station:

Lake Winnipeasukee Discharge
Precipitation
Air Temperature

Lake Winnipesaukee Operating Information

Water Level and Flow Constraints:
June 1 through Columbus Day (Summer Recreation Season)  
To the extent that weather conditions allow, levels are managed between 504.32 and 502.80 to
facilitate the use of the lake for recreational enjoyment.  Depending upon events and forecasts
lake levels are allowed to climb to 504.80 (about 6 inches above full) for short periods of
time to allow discharges at Lakeport to be managed to alleviate or lessen downstream
flooding/flood peaks and to avoid exceeding the capacity of downstream hydropower plants.
Currently, a considerable amount of judgment is applied when making decisions regarding flow
release during these “high water” periods.  Since the wasting of water in excess of the
hydropower capacity at Lakeport Dam (1,050 cubic feet per second (cfs)) is of concern, the
decision to do it is based upon factors such as:  rate of rise (inflow), soil moisture
condition, basin vegetation status, precipitation forecast and estimated length of time to
return levels to within the normal range.  When levels reach 504.50+/-, the number of
complaints regarding shoreline structure damage or usability increases.  This 71-square-mile
lake has hundreds of permanent and seasonal homes with varying degrees of shoreline development
When the level rises much above the full pond level of 504.32, impacts begin to occur.  There
is at least one marina that experiences problems with bridge access (low clearance) when levels
begin to climb above full.

Issues associated with the lower end of the summer recreation range relate to hull/motor
damage to boats and, like high water, to structure usability.  Many abutters are accustomed to
a certain range of water levels during the recreation season.  However, when the lake is at
the lower end of the range, docks and other structures may become less accessible (ex: hull
draft is larger than depth at dock).   The 250 cfs minimum outflow at Lakeport Dam can
sometimes far outpace inflow during the summer recreation season and this, combined with
normal summer evaporation, will cause the lake level to typically drop 12 to 15 inches over
the course of the summer.

Columbus Day through December 31st 
To the extent that weather conditions allow, the lake level is managed between elevations
503.00 and 503.50 during this period by releasing water at a rate that can be fully utilized
by the downstream hydropower plants (250 to 1,050 cfs).  This is done to facilitate shoreline
property maintenance.  If deemed appropriate, and based upon basin conditions and weather
forecasts, levels will be allowed to climb above this range to prevent releases at Lakeport
from exceeding 1,050 cfs.  When the level begins to encroach on the full summer elevation
(504.32), releases will be increased beyond the capacity of the hydropower plants to make
lowering the lake level the first priority.  DES also endeavors to reach a target level of
approximately 502.80 on December 31st, which is approximately six inches above the full
drawdown depth of two feet.  The water stored in this remaining six-inch band is release
during the coldest months of January and February.

January 1st through May 31st 
To the extent that weather conditions allow, water is released from Lakeport Dam to reach the
full 2-foot drawdown (502.32) in the lake by about the end of the first week of March.  The
actual depth of the drawdown varies from year to year depending upon meteorological conditions;
including prevalent base flow rates and snowpack.  From March through May 31st the lake level
is allowed to climb as snowmelt, soil moisture and lake ice conditions allow.  Discharges at
Lakeport Dam are made based on both actual and predicted weather events.  Ideally, flows will
be maintained between 500 and 1,050 cfs throughout the period.  During extremely cold periods,
flows lower than 500 cfs cause frazzle ice to form along a steeply sloped reach upstream of
Franklin center, causing maintenance problems and reduced turbine efficiency at the local
hydropower stations.

Summary of Operation Under Normal Conditions:
Lake Winnipesaukee is filled to between elevation 504.10 and 504.32 by June 1st.  From June 1st
to Columbus day, Lakeport Dam is operated as necessary, and in conjunction with other dams
along the reach depending upon prevailing conditions, to maintain a minimum discharge of 250
cfs and to keep the lake from rising to more than 6 inches over full (504.80).  Natural
meteorological conditions, coupled with the minimum discharge, typically cause the lake to
gradually drop during the months of July through October.  On or near Columbus Day, a two-week
shutdown of flows at Lakeport Dam is initiated to facilitate maintenance in the river reach
from the dam to the confluence of the Winnipesaukee and Pemigewasset rivers.  After the
shutdown, discharges are returned to between 250 and 1,050 cfs, depending upon prevailing
runoff and water level conditions within the basin, to facilitate the generation of hydropower.
These increased flows are maintained until the lake level drops approximately 1.5 feet to
elevation 503.00.  Once this level is reached, the releases are managed so as to provide for
a lake level at or slightly above this elevation on January 1st.   Additionally, DES endeavors
to maintain a discharge between 500 to 750 cfs through the extremely cold months, as lower
flows during these periods promote the formation of frazzle ice, which complicates the
operation at some of the hydropower facilities.  The objective is to achieve a maximum
drawdown elevation of 502.32 in late February or early March, and then begin refilling the
lake in mid to late March depending upon forecasts and the extent of the snowpack.

Summary of Operation Under Flood Conditions:
Releases from Lakeport Dam are kept to a maximum of 1,050 cfs (the maximum capacity of the
hydropower plant at Lakeport), if possible.  If the lake continues to rise or if more rain is
forecast, releases at Lakeport Dam are generally increased in stages of 250 - 500 cfs per day,
and flows are adjusted at the other dams along the river to keep pace with these releases and
local inflow.  Flows above 1,050 cfs are achieved by operating the hydro plant at maximum
capacity and incrementally opening the dam’s 3 large floodgates.  After the peak of the flood
has passed, and after flows in the lower portion of the basin have had an opportunity to
recede, flows at Lakeport Dam are increased and adjusted to keep the lake level receding
until it returns to the approximate level for that time of year.  Any changes to the discharge
at Lakeport Dam are made in consideration of the effects of those changes on the downstream
reach.

The Weirs channel, which is relatively narrow and may be as little as 5 to 6 feet deep in some
areas under full lake conditions, may act to back water up into Lake Winnipesaukee during high
runoff events.  In addition, the measuring flume just upstream of the Lakeport Dam may inhibit
the ability to pass water downstream.  However, the capacity of the flume exceeds other
constraints to flow downstream of Lakeport Dam.  Therefore, the flume is not considered a
limiting factor in flood operations.

Drawdown

Although Lake Winnipesaukee is operated within a 2-foot wide operating band, there isn't a
traditional drawdown of this lake as experienced by many other smaller impoundments
throughout the state.  Rather, the traditional 9 to 12 inch drop of the lake level experienced
through the summer is maintained through the Fall season. Then in January, flows are increased
at Lakeport Dam to gradually lower the lake to about elevation 502.32 - or 2 feet below full
lake.  This level is usually reached in late February or early March.
Lovell Lake dam is located at the west end of the lake in Wakefield.

The following parameter is currently
being measured at this site:

Lovell Lake Stage (Lake Elevation)


Summer Operations
Lake level is maintained at full pond. Full pond is equal to zero 
on local gauge at dam, or, top of stop logs at the dam.


Seasonal Fall Drawdown
Water level is drawn down starting after Columbus day, 
reaching three feet below full pond level most years. 
This is done by removing stop logs at the dam.  
Every 4th year, there is a 4'drawdown (2003,2007,2011,2015, etc.).

									
Spring Refill
Lake is refilled slowly during early winter months, 
then full pond is achieved after ice out.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.

This station is located adjacent to the NH Route 3/11 bridge that bisects the
upper and lower portions of the lake.  The following parameters are currently
being measured at this station:

Lake Winnisquam Stage (Lake Elevation)
Precipitation
Air Temperature


Water Level and Flow Constraints:
The area of most pronounced hydraulic significance is the channel that connects
the main portion of Lake Winnisquam and its control structure, the Lochmere Dam.
Because this channel is relatively narrow and extremely shallow, the level of
Winnisquam must rise to achieve increased discharge at the dam. If discharges at
the dam outpace those that this channel can provide, a local drawdown will occur
between the high point of the channel (control section) and the dam.  This
condition will be interpreted by the hydro plant at Lochmere Dam as insufficient
flow to generate power, and one or more turbines will automatically shut down.
The net effect will be that Lake Winnisquam will begin to rise at a faster rate
because of the reduced outflow at the dam.  As such, coordinated flows between
Lakeport and Lochmere dams, coupled with regular monitoring of the machinery at
the Lochmere plant, are required during high flow conditions.

Much like the potentially flow constricting sections at the Weirs channel and at
the measuring flume inhibiting flows from Lake Winnipesaukee, the natural control
section of the channel upstream of the Lochmere Dam does not appear to greatly
limit the ability to pass flood flows through Lake Winnisquam.  However, the
control section does require the lake level to rise to pass these flows, and also
requires great care and effort to operate the Lochmere Dam to maintain its full
discharge capacity during floods.

High water events of the past have raised the lake to 2 feet above its normal
operating level, while prolonged drawdowns have resulted in a lake level 2 feet
lower than normal.  Both extremes are best avoided, especially the high levels.
Since the level of Lake Winnisquam generally fluctuated within a 7-inch operating
range, the shoreline structures around the lake, which tend to be permanent and
designed to function within this range, are inundated when lake levels are high.
Low water issues are less numerous, but over the years - especially following
relatively dry summers - some shallow dug wells have been impacted.  But, much
like the case with Opechee Lake, drawdowns are short in duration and lake levels
easily return to normal when discharges are resumed at Lakeport Dam.

Due to the relative inflexibility of the turbine units at Lochmere Dam, the rise
and fall of lake levels at Lake Winnisquam must be addressed through management
of the releases from Lakeport Dam upstream.  The four hydro units at Lochmere Dam
are normally configured to pass about 250 cfs each and cannot be adjusted
automatically.  Adjustments to the capacity of each machine are possible only by
changing washers (spacers) to adjust turbine blade angle.  Such adjustments are
labor intensive and require that the machine be shut down, hoisted out of its pit
and manually reconfigured.  The sole automated feature is one that will shut the
machines down (individually) when the water level upstream falls to a point
indicating that not enough water is flowing through the upstream channel to meet
the discharge capacity of the turbines.  If a machine is turned off in this way,
the corresponding rebound of the water level upstream is usually enough to
prevent additional machines from turning off.

Summary of Operation Under Normal Conditions:
The level of Winnisquam Lake is maintained between 482.17 and 482.77 on the lake
gage, or within a 7-inch operating band, through the manipulation of the
hydroelectric energy generating units at the Lochmere Dam.  These units can pass
up to a maximum of nearly 1,200 cfs before manual operations (opening gates or
removing stoplogs) are required.  A small turbine or manual operations provides
between 35 to 45 cfs to the bypass reach on a year-round basis.  By manipulating
flows on the basis of Lakeport discharges and local inflow, the level of Lake
Winnisquam can be kept within the bounds of the operating band fairly easily.  

Summary of Operation Under Flood Conditions:
For flows above approximately 1,200 cfs, it becomes necessary to manually open
waste gates or remove stoplogs at the dam.  As flows continue to increase, an
occurrence that is usually directly related to discharges from the Lakeport Dam,
care must be taken to avoid over-operating the dam.  The channel that provides
the connection between the main lake and the dam is quite shallow in some areas,
so the possibility exists that the dam can be opened up to pass more than this
channel can provide.  This would result in an exaggerated drawdown just upstream
of the dam, which in turn, would cause one or more of the turbines to
automatically shut down.   NHDES staff monitors a staff gage at the right
abutment of the Lochmere Dam, so it is generally possible to track this
localized drawdown and compensate as necessary.  All too often, however, rapidly
changing conditions (sharply rising or falling inflows) require the need for
timely and frequent visits to the site.  As noted, discharges from Lake
Winnisquam are related to and dependent upon conditions at Lakeport Dam,
especially during flooding.

Drawdown:
Lake Winnisquam is drawn down approximately 2 feet every other Columbus Day (even
numbered years) for a period of approximately two weeks. Except for the obvious
impacts to access and recreation during the bi-annual two-week drawdown, low water
issues are rarely encountered.
This station is located at the Mascoma Lake Dam, which is located at the
western end of the lake in Lebanon.  The following parameters are currently
being measured at this station:

Mascoma Lake Stage (Lake Elevation)
Mascoma River Stage / Flow
Precipitation
Air Temperature


Summer Operations
The lake level is managed by bringing it up to full summer recreation level by
June 1st, then keeping the lake at or near this level, as meteorological
conditions and minimum flow releases allow, through Columbus Day.  Summer
level corresponds to an elevation of 750.00 m.s.l. or 7.0 on the staff gage
located at the dam.

Seasonal Fall Drawdown
After Columbus Day the lake is slowly lowered to a target drawdown of 3 feet
below full pond (or 4.0 on the gage) to allow shorefront maintenance to occur
and to prepare for spring runoff.  The drawdown is accomplished by operating
the dam's floodgates or spillway crest gate.

Spring Refill
The lake is raised to its summer recreation level between mid late April and
early June.  The Department of Environmental Services (DES) makes operations
each April to facilitate the annual whitewater canoe event sponsored by the
Ledyard Canoe Club of Dartmouth College. This 2-day event, which is generally
held on the second weekend of the month, requires raising the level of the lake
to allow flows of between 500 and 1,000 cubic feet per second to be released.

Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are mantained by the adjustment of flows at the dam in response 
to these conditions.
This station is located at the Newfound Lake Dam, which is located at the
southerly end of the lake in Bristol. The following parameters are currently
being measured at this station:

Newfound Lake Stage (Lake Elevation)*
Newfound River Stage / Flow
Precipitation
Air Temperature

*A gage reading of 6.0' corresponds to an elevation of 587.88'.


Spring Refill
Lake is filled between mid May and early June to a level of approximately
6.0' on the staff gage located just upstream of the bridge that crosses
the outlet brook at the south end of the lake. It is not unusual to see spring
lake levels significantly higher than 6.0'.

Summer Operations
Lake level is managed by bringing it up to full or 6.0' on the gage, then it
is allowed to gradually lower over the course of the summer in order to reach
a target gage reading of 4.5' on Columbus Day.


Seasonal Fall Drawdown
After Columbus Day the lake is slowly lowered to a target drawdown of 3 feet
below full pond to allow shorefront maintenance to occur and to prepare for
spring runoff.  The drawdown is accomplished by the operations of flood gates
and the removal of stoplogs at the dam.


Note: Water levels generally fluctuate in response to precipitation, snowmelt,
drought or other meteorological conditions. Target water levels are mantained
by the adjustment of flows at the dam in response to these conditions.

Northwood Lake dam is located at the west end of the lake in Epsom.

The following parameter is currently
being measured at this site:

Northwood Lake Stage (Lake Elevation)


Summer Operations
Lake level is maintained at full pond. Full pond is equal to 0.0 
on local gauge, or the top of spillway at the dam.


Seasonal Fall Drawdown
After Columbus Day the lake is slowly lowered to a target 
drawdown of six feet below full pond. The usual drawdown is five to 
five and a half feet below full pond. 
This is done by the removal of stoplogs at the dam.


Spring Refill
Lake is filled just after ice out or by May 1st. This is done by 
replacing the stoplogs at the dam.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.

No meteorological data is collected at this site.  There are 2 staff gages, one at the
Avery Dam and another on a pier just upstream of the Messer Street Bridge, that are
read manually 2 or 3 times per week.  The staff gage upstream of the Messer Street
Bridge more accurately represents the level of Opechee Lake.

Opechee Lake Operating Information:

Water Level and Flow Constraints:
Under normal operating conditions at Lakeport Dam, flows into Opechee Lake are well within
the range of the two turbines and automated crest gates at Avery Dam (outlet from Opechee).
At flows of between 250 and 1,000 cfs, the level of Opechee ranges between 492.7 and 493.2,
respectively.  However, at flows above about 500 cfs, the localized drawdown between the
Opechee Lake gage and the gage at the Avery Dam becomes more pronounced.  These two staff
gages are separated by approximately 0.6 miles of relatively narrow river channel with two
roadway bridges and one railroad crossing.  When viewed during drawdown conditions, this
section of river exhibits numerous riffle sections.

During the June 1984 flood event, the difference in elevation between the main body of
Opechee and the dam peaked at 2.3 feet (494.3 vs. 492) at an estimated flow of
approximately 3,000 cfs.  Similarly, in June 1998 this difference was approximately 1.8
feet (494.5 vs. 492.7) at a flow of nearly 2,600 cfs.  The structural configuration of the
dam was modified some time after 1984 during the installation of the hydro works, so
discharge capacities at the dam differed between the two flood events.  

Summary of Operation Under Normal Conditions:
The level of Opechee Lake is maintained at a relatively constant level throughout the year
through a combination of hydroelectric energy generation and a system of automated leaf
gates along the crest of the Avery Dam.  For inflows up to a maximum of 700 cfs, the
turbines at Avery Dam self-adjust to pass exactly what is entering the lake, and the net
effect is a level reservoir.  For flows higher than 700 cfs, the turbines will be at
maximum capacity and the leaf gates at Avery Dam will automatically lower to pass surplus
flows and maintain a relatively constant reservoir level.

Summary of Operation Under Flood Conditions:
For flows up to approximately 1,500 to 2,000 cfs, the two turbines are kept on line while
the automatic leaf gates adjust in response to pool levels, waste gates are opened and
stoplogs are removed.  Beyond 2,000 cfs, the turbines are raised from their pits providing
additional capacity, which allows the crest gates to rebound upward in response to the
additional discharge capacity through the vacated turbine pits.  As inflows continue to
climb, the leaf gates will again lower automatically to keep pace.  Should inflows
increase to the point that the leaf gates have fully lowered, there are two 3.25’ high by
25’ wide flashboard sections that must be manually tripped.  None of the high water events
to date have required tripping either of the flashboard sections, and it appears that the
channel upstream of the dam controls discharges.     

Drawdown:
Opechee Lake is drawn down approximately 5 feet every other Columbus Day (even numbered
years) for a period of approximately two weeks, but it has occasionally ebbed lower.
Except for the obvious impacts to access and recreation during the bi-annual two-week
drawdown, low water issues are rarely encountered.  Because of its automated hydroelectric
machinery, lake levels can be managed to avoid low water conditions.
This station is located on the western shore of the main body of the lake
at the Westward Shores Campground marina. The following parameters are
currently being measured at this station:

Ossipee Lake Stage (Lake Elevation)
Precipitation
Air Temperature


Spring Refill
Lake is filled between mid May and early June to a level of approximately
7.25 feet as measured at the gage. 

Summer Operations
Lake level is managed by bringing it up to full or 7.25 on the gage, then
releases at the dam are adjusted based upon inflow to keep this elevation
up to Columbus Day.


Seasonal Fall Drawdown
After Columbus Day the lake is slowly lowered to a target 
drawdown of about 3.5 feet below full pond to allow shorefront maintenance
to occur and to prepare for spring runoff.  The drawdown is accomplished
by the operations of flood gates and the removal of stoplogs at the dam.
All floodgates remain open and all stoplogs remain out throughout the late
fall, winter and most of the spring.  As runoff lessens, gates are closed
and stoplogs are replaced at a pace to achieve the normal summer level.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt,drought or other meteorological conditions. Target water levels 
are mantained by the adjustment of flows at the dam in response 
to these conditions.
This station is located on the Ossipee River in Effingham, approximately
1,000 feet upstream of the NH route 153 bridge. The following parameters
are currently being measured at this station:

Ossipee River Stage / Flow
Air Temperature

As this gage is located only about 1/4 of a mile downstream of the Ossipee
Lake Dam, the flow data collected here can be used as an accurate measure
of releases at the dam.
LOCATION:
Durham, NH 
Latitude 43°08'55", Longitude 70°57'56" NAD27
Adjacent to NH route 155A, approximately 1/2 mile east of NH route 155.
Strafford County, New Hampshire , Hydrologic Unit 01060003
 
DRAINAGE AREA:
12.10 square miles.

GAGE:
Datum of gage is 70.00 feet above sea level NGVD29.

SITE TYPE:
Oyster River Stage / Flow

OPERATION: 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link at the
top of this page.
LOCATION:
Plymouth, NH
Latitude 43°45'33", Longitude 71°41'10" NAD27
Approximately 200 feet downstream of the NH route 175 bridge.
Grafton County, New Hampshire , Hydrologic Unit 01070001 

DRAINAGE AREA:
622.00 square miles.

GAGE:
Datum of gage is 457.07 feet above sea level NGVD29. 

SITE TYPE:
Pemigewasset River Stage / Flow

OPERATION: 
Record for this site is maintained by the USGS office in New Hampshire.

More information may be obtained from the USGS by using the link at the
top of this page.
This station is located on Poorfarm Brook in Gilford, at the Ellacoya
State Park facility.  The following parameters are currently being
measured at this station:

Precipitation
Air Temperature
Powwow Pond dam is located at the south/east end of the 
lake in East Kingston.

NOTE: THE FALL OF 2007 POWWOW POND WILL HAVE A THREE FOOT DRAWDOWN
STARTING ON OCTOBER 1st.


The following parameter is currently
being measured at this site:

Powwow Pond Stage (Lake Elevation), CFS release, percipitation, 
air temperature, humidity,and lake temperature. Note: Precipitation
is not recorded in the winter months from October to April

 
Summer Operations
Water level stays at full pond. Full pond equals top of flash boards.


Seasonal Fall Drawdown
Lake level is lowered by one foot by removing stoplogs, 
then removing flash boards from the spillway.
This operation starts on November 1st of each year.


Spring Refill
Near the end of spring runoff, flash boards and stoplogs are 
replaced to achieve full pond.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
LOCATION 
Rumney, NH
Latitude 43°47'44", Longitude 71°50'45" NAD27
Approximately 4.8 miles west of the intersection of NH routes 3A and 25.
Grafton County, New Hampshire , Hydrologic Unit 01070001 

DRAINAGE AREA
143.00 square miles.

GAGE
Datum of gage is 495.00 feet above sea level NGVD29. 

SITE TYPE
Baker River Stage / Flow 

OPERATION 
Record for this site is maintained by the USGS office in New Hampshire.

More information may be obtained from the USGS by using the link at the
top of this page.
LOCATION:
Penacook, NH 
Latitude 43°14'59", Longitude 71°37'12" NAD27
Approximately 4 miles upstream of the confluence with the Merimack River.
Merrimack County, New Hampshire , Hydrologic Unit 01070003 

GAGE:
Datum of gage is 340 feet above sea level NGVD29.

SITE TYPE:
Contoocook River Stage

OPERATION: 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link at the
top of this page.
This station is located at the Milton 3-Ponds Dam, which is located at the
southern end of the lake in Milton.  The following parameters are currently
being measured at this station:

Milton 3-Ponds Stage (Lake Elevation)
Salmon Falls River Stage / Flow
Precipitation
Air Temperature


Summer Operations
The lake level is managed by bringing it up to full summer recreation level by
June 1st.  Summer level corresponds to an elevation of 413.87 m.s.l. or 15.25
on the staff gage located at the dam's right abutment.  Over the course of the
summer months the pond tends to ebb, so that by Columbus Day the level is
between 6 and 12 inches lower.  

Seasonal Fall Drawdown
After Columbus Day the lake is slowly lowered to a target drawdown of 12.0 on
the gage, or about 3.25 feet below the June 1st target level, to allow
shorefront maintenance to occur and to prepare for spring runoff.  The drawdown
is accomplished by operating the dam's floodgates or spillway crest gate.

Spring Refill
The lake is raised to its summer recreation level between mid late April and
early June.  

Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are mantained by the adjustment of flows at the dam in response 
to these conditions.
This station is located on Shannon Brook in Moultonborough, adjacent
to NH Route 109 and approximately 3 miles northeast of Melvin Village.
The following parameters are currently being measured at this
station:

Precipitation
Air Temperature
This station is located on Silver Lake, just below the canal and hydroelectric station
associated with the Lochmere Dam in Belmont. The following parameters are currently
being measured at this station:

Silver Lake Stage (Lake Elevation)
Precipitation
Air Temperature

Silver Lake Operating Information

Water Level and Flow Constraints:
The combination of the natural outlet of Silver Lake and the flat marshy expanse at the
junction of the Tioga and Winnipesaukee Rivers acts to slow the movement of runoff
through Silver Lake.  When flows into this part of the watershed increase, either as a
result of increased discharge at Lakeport/Lochmere Dams or uncontrolled runoff from the
Tioga River basin, the level of Silver Lake must increase to pass this additional flow.
By correlating lake level data at Silver Lake with flows at the Winnipesaukee River gage
in Tilton, there seems to be evidence to support that the stage-discharge relationship
of the natural channel at the downstream end of Silver Lake may vary due to the
periodic build-up of river sediment and/or blockage along the outlet channel.  During
low flow periods slow moving water allows sediment to settle, while springtime flows or
larger floods may have the opposite effect of removing accumulated sediment.  This
constantly changing nature of the streambed in the area of the natural outlet of Silver
Lake causes the natural outlet's ability to discharge water to fluctuate. 

Routine operations of upstream dams result in flows between 250 and 1,000 cfs at the
river gage in Tilton, and the corresponding levels of the lake are 463.80 and 465.76,
respectively.    When the flows are reduced significantly, as can be the case during the
annual 2-week shutdown of Lakeport Dam, the level of the lake can get as low as 462.81
when flows are down to 40 cfs.  When flows at the Tilton gage reach 4,300 cfs, Silver
Lake reaches a level of 470.36.   History has shown that when the lake level gets to
about 468, which corresponds to a flow of approximately 2,000 cfs at the Tilton gage,
low-lying properties begin to experience some form of low to moderate flooding.

Summary of Operation Under Normal Conditions:
The elevation of Silver Lake is a function of the amount of water entering and leaving
the lake, as the lake has a natural outlet with no man-made influences to affect
discharge capacity.  Since the powerhouse at the Lochmere Dam discharges directly into
Silver Lake, the releases at the dam have a significant effect on the operating level
under normal meteorological conditions. The 32 square mile Tioga River watershed enters
near the downstream end of Silver Lake.  The lake’s outlet control appears to be located
in the area of the NH Route 140 bridge crossing.    Comparing the level of the lake to
the flows measured at the flow-measuring gage in Tilton shows that for flows between 250
cfs and 1,000 cfs, which are those considered normal and reasonably expected on a
routine basis, the level fluctuates over a range of approximately 1.9 feet.  The level
of Silver Lake can and does fluctuate on a frequent basis.  Most shorefront residents
are well aware of this and, when these fluctuations are within these limits, use of
shorefront property and recreational pursuits are essentially unaffected.  

Summary of Operation Under Flood Conditions: 
Since there is no ability to pass additional flows at the outlet of the lake beyond the
capacity of the natural channel, the only variable that can be controlled, which during
floods may be limited, is the discharge into the lake from Lake Winnisquam (Lochmere
Dam).  This discharge, in turn, is usually dictated by conditions at Lakeport Dam.  In
addition, the Tioga River drainage area alone can produce a significant amount of
runoff.  Under conditions that require additional discharges from Lochmere Dam, the
Tioga River is generally also approaching peak flows, which can contribute to elevating
peak lake levels and the corresponding flooding around Silver Lake.  Operational
decisions related to managing the level of Silver Lake involve both Lakeport and
Lochmere dams.  In cases when storage room exists in either Winnipesaukee or Winnisquam
lakes, use of this storage may result in a significant reduction of the peak level of
Silver Lake during an event.  Lake Winnisquam, however, has over 50 square miles of
additional contributing drainage area the runoff from which can quickly fill any
available flood storage.  In addition, the peak inflows to Winnisquam and Silver lakes
from each of their respective local drainage areas arrive at approximately the same
time, necessitating releases at Lochmere Dam at times when the level of Silver Lake is
already high.
  
Drawdown

There is no annual drawdown of Silver Lake.  However, when flows at Lochmere Dam are
reduced to approximately 50 cfs, as they are every second year when Lake Winnisquam does
not experience a temporary 2-week drawdown, the level of Silver Lake is reduced to about
1.2 feet below it's normal summer operating level corresponding to a 250 cfs release 
from Lochmere Dam. 
Souhegan Flood Control Dam 19 is located on Rt. 123A in New Ipswich,
approximately 3 miles south of intersection of Rt. 123A & 124.

The following parameters are currently being measured at this site:

Souhegan 19 Impoundment Stage (Lake Elevation)
Precipitation
Air Temperature

Souhegan Flood Control Dam 19 is designed to maintain a normal pool level and release excess water 
without operations. Normally the pond drain line gate is closed.  The normal level is maintained by 
the low stage orifice openings.  The principal spillway riser and reservoir storage is designed to retard 
runoff from up to a 100 yr storm without flow occurring in the auxiliary spillway.

Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
Souhegan Flood Control Dam 28 is located on Old Temple Road in Lyndeborough,
approximately 5 miles northwest of Wilton Center on Rt 31.

The following parameters are currently being measured at this site:

Souhegan 28 Impoundment Stage (Lake Elevation)
Precipitation
Air Temperature

Souhegan Flood Control Dam 28 is designed to maintain a normal pool level and release excess water 
without operations. Normally the pond drain line gate is closed.  The normal level is maintained by 
the low stage orifice openings.  The principal spillway riser and reservoir storage is designed to retard 
runoff from up to a 100 yr storm without flow occurring in the auxiliary spillway.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
LOCATION:
Pembroke, NH 
Latitude 43°12'49", Longitude 71°28'51" NAD27
Just upstream of the Pembroke Road bridge crossing.
Merrimack County, New Hampshire , Hydrologic Unit 01070002 

DRAINAGE AREA: 
81.9 square miles.

GAGE:
Datum of gage is 265 feet above sea level NGVD29.

SITE TYPE:
Soucook River Stage / Flow
Precipitation
Air Temperature

OPERATION: 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link at the
top of this page.
This station is located on the abutment of the US route 3/NH route
25 bridge that crosses over the channel separating Squam and Little
Squam Lakes. The following parameter is currently being measured at
this station:

Squam Lake Stage (Lake Elevation)


Spring Refill
Lake is filled between early May and early June to a level of approximately
12.5 feet on the gage. 

Summer Operations
Lake level is managed by bringing it up to full or 12.5 on the gage, then
adjusting releases at the dam to try to keep the lake as near to 12.5 as
possible through Columbus Day.

Seasonal Fall Drawdown
After Columbus Day the lake is slowly lowered to a target drawdown of 2.5
to 3 feet below full pond to allow shorefront maintenance to occur and to
prepare for spring runoff.  The drawdown is accomplished by the operation
of hydroelectric turbines and flood gates at the dam.



Note: Water levels generally fluctuate in response to precipitation,
snowmelt,drought or other meteorological conditions. Target water levels 
are mantained by the adjustment of flows at the dam in response 
to these conditions.
Sunset Lake dam is located at the south end of the lake in Alton.

The following parameter is currently
being measured at this site:

Sunset Lake Stage (Lake Elevation),precipitation, air and lake temperature.
Note: Precipitation is not recorded in the winter months from October to 
April.

Summer Operations
Lake level is maintained at full pond. Full pond is equal 
to 0.0 on local gauge at the dam, or top of spillway.


Seasonal Fall Drawdown
After Columbus Day dam gates are opened to allow for a seven foot 
drawdown from full pond level.


Spring Refill
Dam gates are closed to refill lake after runoff from snowmelt 
and ice out.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.










Suncook Lake dam is located at the south end of Lower Suncook Lake
in Barnstead.

The following parameter is currently
being measured at this site:

Suncook Lake Stage (Lake Elevation)


Summer Operations
Lake level is maintained at full pond. Full pond is equal to top 
of the spillway at the dam.


Seasonal Fall Drawdown
Drawdown begins on October 1st. Full drawdown is reached by 
Columbus Day in most years. This is done by opening the gates at the dam. 
Note: The water level at the dam is two to three feet lower than the 
lake level at the Narrows Bridge (between upper and lower Suncook Lakes)
gauge during winter operations


Spring Refill
Lake is refilled after spring runoff season ends and ice out.


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.


Sunapee Lake Dam is located at the western end of at Sunapee Harbor,
approximately 1/4 mile east of the intersection of NH routes 11 and 103.

The following parameters are currently being measured at this site:

Sunapee Lake Stage (Lake Elevation)
Precipitation
Air Temperature

Summer Operations
The lake level is maintained as close to the full summer recreation level as
possible, as meteorological conditions and minimum flow requirements allow.
Full summer recreation level is 10.5 on the gage at Sunapee Harbor, which
corresponds to an elevation of 1093.15.

Seasonal Fall Drawdown
Drawdown begins on or near Columbus Day.  The lake is drawn down 2.5 feet
(elev. 1090.65) below the summer recreation level, and full drawdown is 
generally reached by February or March in most years. The drawdown is
accomplished by opening the gates at the dam.

Spring Refill
Lake is refilled to the full summer recreation level between March and June
1st as the snowpack melts and spring rains occur.   


Note: Water levels generally fluctuate in response to precipitation,
snowmelt, drought or other meteorological conditions. Target water levels 
are maintained by the adjustment of flows at the dam in response 
to these conditions.
LOCATION 
Latitude 43°26'30", Longitude 71°35'17" NAD27
This station is located on the Winnipesaukee River in Tilton, just downstream of the
Bridge Street crossing.
Belknap County, New Hampshire , Hydrologic Unit 01070002 

DRAINAGE AREA 
471.00 square miles.

GAGE
Datum of gage is 441.87 feet above sea level NGVD29.

SITE TYPE
Winnipesaukee River Stage / Flow
Precipitation
Air Temperature

OPERATION: 
Record for this site is maintained by the USGS office in New Hampshire.


More information may be obtained from the USGS by using the link at the
top of this page.

OPERATING INFORMATION

Winnipesaukee River in Tilton, Northfield and Franklin:

Water Level and Flow Constraints:
The levels of the Winnipesaukee River through the towns of Tilton and Northfield are
a function of the flows being discharged from dams upstream and from the uncontrolled
runoff into the river channel downstream of the dams.  There are approximately 13
square miles of local drainage area between the outlet of Silver Lake and the
flow-measuring gage in Tilton.  History has shown that though some flooding does
occur for flows up to approximately 3,500 cfs as recorded at the gage in Tilton,
damaging flooding is largely avoided. For flows over 3,500 cfs, significant flooding
of low-lying areas begins to occur.

Drawdown

On or near Columbus Day, a two week shutdown of flows at upstream dams is initiated to
facilitate maintenance in the river reach from Lakeport Dam to the confluence of the
Winnipesaukee and Pemigewasset rivers in Franklin. During these times, a minimum flow
of approximately 50 cfs is maintained in the river reach downstream of the outlet of
Silver Lake, as measured at the stream gage in Tilton.  After the shutdown, discharges
are normally returned to between 250 and 1,200 cfs, depending upon the prevailing
hydrologic conditions being experienced by the watershed and the water levels in
upstream lakes.
This station is located on the Mascoma River, adjacent to an
abandoned railroad bed and approximately 2.5 miles east of
Enfield. The following parameters are currently being measured
at this station:

Mascoma River Stage / Flow
Precipitation
Air Temperature
LOCATION
Laconia, NH 
Latitude 43°36'27", Longitude 71°27'34" NAD27
This station is located beneath the Weirs Beach boardwalk and 
adjacent to the City of Laconia's public docks.
Belknap County, New Hampshire , Hydrologic Unit 01070002 

DRAINAGE AREA 
363.00 square miles.

GAGE
Datum of gage is 500.00 feet above sea level NGVD29.

SITE TYPE
Lake Winnipesaukee Stage (Lake elevation)
Precipitation
Air Temperature



For information relative to the operational parameters used 
to manage Lake Winnipesaukee, or to learn what the current discharge 
is from the lake, please return to the map interface and select the 
link for the Lakeport Dam.
This station is located in Weare at the Everett Lake Dam, which impounds the southern
portion of the Hopkinton-Everett Lake Project and diverts the Piscataquog River. The
following parameters are currently being measured at this station:

Everett Lake Stage (Reservoir Elevation)
Piscataquog River Stage / Flow
Precipitation


More information about this site may be obtained by clicking on the link below:


http://www.nae.usace.army.mil/recreati/hel/helhome.htm

This station is located in West Hopkinton at the Hopkinton Lake Dam, which impounds
the northern portion of the Hopkinton-Everett Lake Project and diverts the Contoocook
River. The following parameters are currently being measured at this station:

Hopkinton Lake Stage (Reservoir Elevation)
Contoocook River Stage / Flow
Precipitation
Air Temperature


More information about this site may be obtained by clicking on the link below:


http://www.nae.usace.army.mil/recreati/hel/helhome.htm

This station is located at the Wolfeboro Fire Department on Route 28,
approximately 1 mile east of the Town's center.
 
The following parameters are currently being measured at this station:***

Air Temperature
Barometric Pressure
Precipitation
Relative Humidity
Wind Direction
Wind Speed

***Although all of these parameters are currently being measured, the
graphical displays for only Air Temperature and Precipitation are
configured.  DES hopes to have all parameters reporting on this web site
by the end of 2005.
LOCATION 
Woodstock, NH
Latitude 43°58'34", Longitude 71°40'48" NAD27
Approximately 1.5 miles north of the Woodstock/Thornton boundary.
Grafton County, New Hampshire , Hydrologic Unit 01070001 

DRAINAGE AREA
193.00 square miles.

GAGE
Datum of gage is 615.00 feet above sea level NGVD29. 

SITE TYPE
Pemigewasset River Stage / Flow
Precipitation

OPERATION 
Record for this site is maintained by the USGS office in New Hampshire.

More information may be obtained from the USGS by using the link at the
top of this page.



This meteorological station is operated and maintained by
the New Hampshire Department of Environmental Services (DES).
Most data relayed by satellite or other telemetry have received
little or no review. Inaccuracies in the data may be present
because of instrument malfunctions or physical changes at the
measurement site, including backwater effects due to ice formation.
Although the data presented herein is intended to be an accurate
representation of actual conditions, it is presented for
informational purposes only and the user is cautioned to use it at
his/her own risk.   

NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

copyright 2008. State of New Hampshire