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Tuesday, Aug. 20, 2019
Current Beach Advisories as of Aug 20, 2019
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Note: The map may not display accurate icons for a short time after any update. The charts below listing advisories and warnings are updated instantly by DES Beach Program staff.

Current Beach Advisories

Advisories are updated daily during the swim season. Beaches are only listed here if the most recent fecal bacteria or cyanobacteria sample analysis exceeded state standards. Results are available through the OneStop database.

Beach sampling/monitoring is conducted between Memorial Day and Labor Day.

For beach and advisory details, sampling results, and yearly reports, conduct a OneStop search.

Summary reports of monitoring seasons are also available at: http://des.nh.gov/organization/divisions/water/wmb/beaches/beach_reports/index.htm .

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To receive future Beach Advisory Newsletters, join the NHDES E-Mail List.  https://www.des.nh.gov/media/enews/index.htm

For explanations about advisories and procedures, please visit the Beach Advisories page: http://des.nh.gov/organization/divisions/water/wmb/beaches/advisories.htm.

Beach NameBeach TownWater TypeCommunicationDate PostedAdvisory Type
GILMANTON TOWN BEACH - CRYSTAL LAKEGILMANTONFRESHWATERSAMPLES COLLECTED 7/11, 7/15, 7/17, 7/22, 7/23, 7/29, AND 8/7 EXCEEDED THE STATE STANDARD FOR FECAL BACTERIA. THE ADVISORY REMAINS UNTIL LABOR DAY.7/12/2019 Fecal Bacteria

Cyanobacteria Advisories

Cyanobacteria Advisories are issued when there are blooming conditions and cyanobacteria cell concentrations exceed 70,000 cells/ml in recreational waters.

Date of AdvisoryDescription of Advisory
7/11/2019KEYSER POND, HENNIKER. A possible toxin-producing cyanobacteria (blue-green algae) bloom has been observed appearing as bluish-green flecks and green, pea soup color throughout the water and along shorelines. Please be advised conditions can change and bloom conditions may shift. Lake users should avoid contact with the water in areas experiencing cyanobacteria bloom conditions and keep pets out.
7/26/2019MARSH POND, NEW DURHAM. A possible toxin-producing cyanobacteria (blue-green algae) bloom has been spotted appearing as blue-green surface scums, accumulating at the surface and along the shorelines at certain times of the day. Surface bloom samples have not been collected at this time. This waterbody is carefully monitored by UNH and others, and a deep layer of cyanobacteria has been identified and confirmed. Please be advised that conditions can change and bloom conditions may disperse around on the lake. Lake users should avoid contact with the water in areas experiencing cyanobacteria bloom conditions and keep children and pets out.
8/13/2019SILVER LAKE, HOLLIS. A possible toxin-producing cyanobacteria (blue-green algae) bloom has been accumulating along the shorelines, beach and boat launch. Please be advised conditions can change and bloom conditions may occur elsewhere along the shoreline or within the lake. Lake users should avoid contact with the water in areas experiencing cyanobacteria blooms and keep children and pets out. Daily observations by park staff will continue.
8/16/2019JERICHO LAKE, BERLIN. A possible toxin-producing cyanobacteria (blue-green algae) bloom has been accumulating along the shoreline and beach. Please be advised conditions can change and bloom conditions may occur elsewhere along the shoreline or within the lake. Lake users should avoid contact with the water in areas experiencing cyanobacteria blooms and keep children and pets out.
8/19/2019SCOBIE POND/HAUNTED LAKE, FRANCESTOWN. A possible toxin-producing cyanobacteria (blue-green algae) bloom has been accumulating along the shoreline and coves of the lake, appearing as small blue- green clumps in the water. Please be advised conditions can change and bloom conditions may occur elsewhere along the shoreline or within the lake. Lake users should avoid contact with the water in areas experiencing cyanobacteria blooms and keep children and pets out.
8/7/2019MIRROR LAKE, TUFTONBORO. A possible toxin-producing cyanobacteria (blue-green algae) bloom has been spotted appearing as blue-green globs at the surface, along the shorelines and the boat launch area. Please be advised conditions can change and bloom conditions may appear elsewhere on the lake. Lake users should avoid contact with the water in areas experiencing cyanobacteria bloom conditions and keep children and pets out.
8/9/2019HUNKINS POND, SANBORNTON. Elevated concentrations of a possible toxin-producing cyanobacteria (blue-green algae) bloom has been observed. There are no surface scums, however the water appears dark and turbid with low visibility. Lake users should avoid contact with the water in areas experiencing cyanobacteria bloom conditions and keep children and pets out.