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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
01077400 COCKERMOUTH RIVER BELOW HARDY BROOK, AT GROTON, NH
LOCATION - Lat 43°42'14", long 71°50'00" referenced to North American Datum of 1983, Grafton County, NH, Hydrologic Unit 01070001, 50 ft upstream from North Groton Road, 200 ft downstream from Hardy Brook, 0.2 mi northeast of North Groton Road, Groton Road, and Sculptured Rocks Road intersection at Groton, and 9.1 mi northwest of South Main Street (NH 3A), Summer Street (NH 104), and Pleasant Street (NH 3A/104) intersection in Bristol.
DRAINAGE AREA - 21.4 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records: September 2008 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 608.42 ft above North American Vertical Datum of 1988.
COOPERATION - New Hampshire Department of Environmental Services and USGS Groundwater and Streamflow Information Program.
REMARKS -
Water Years 2014-2015 and 2020: Records good except those for estimated discharges and those below 10 ft³/s, which are fair.
Water Year 2016: Records good.
Water Year 2017: Records fair.
Water Years 2018-2019: Records good except those for estimated discharges, which are fair.
Water Year 2021-2022: Records fair except those for estimated discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 8920 ft³/s, July 11, 2019, gage height, 11.99 ft; minimum discharge, 0.53 ft³/s, Sep 20 and 21, 2020.
