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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: |
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: |
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: |
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. |
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