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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.
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USGS Water-Year Summary 2024
01154500 CONNECTICUT RIVER AT NORTH WALPOLE, NH
LOCATION - Lat 43°07'34", long 72°26'14" referenced to North American Datum of 1927, Cheshire County, NH, Hydrologic Unit 01080104, on left bank, 100 ft upstream from Saxtons River, 0.7 mi downstream from Vilas Bridge between Bellows Falls, VT, and North Walpole, 1.0 mi south of Main Street and New Hampshire State Highway 12 intersection in North Walpole, and at mile 172.5.
DRAINAGE AREA - 5,493 mi². includes that of Saxtons River.
REVISIONS HISTORY - Datum of gage was revised on Sep 16, 2022 from 218.63 ft above NGVD of 1929 to 217.53 ft above NAVD of 1988.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records: March 1942 to current year.
GAGE - Water-stage recorder. Datum of gage is 217.53 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 2014-16: Records good except those for estimated discharges, which are fair.
WATER YEARS 2017-22: Records good except those below 7,000 ft³/s and those for estimated discharges, which are fair.
Flow regulated by power plants and by First Connecticut and Second Connecticut Lakes, Lake Francis, Moore and Comerford Reservoirs, and other reservoirs, combined usable capacity about 24.8 billion ft³.
WATER YEARS 2017-22: Records good except those below 7,000 ft³/s and those for estimated discharges, which are fair.
Flow regulated by power plants and by First Connecticut and Second Connecticut Lakes, Lake Francis, Moore and Comerford Reservoirs, and other reservoirs, combined usable capacity about 24.8 billion ft³.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since at least 1750, 43.8 ft, March 19, 1936, from floodmarks.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 99,700 cfs, Aug. 29, 2011, gage height, 31.38 ft.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1954 to 1958, 1963 to 1968, 1970, 1975 to 1977, 1981 to 1999, and 2003 to
2007.
SPECIFIC CONDUCTANCE: October 1980 to November 1981. Record at site 01155050, Connecticut River at Walpole, NH, are
considered equivalent, Water years 1975 to 1980.
WATER TEMPERATURES: October 1980 to September 1981. Record at site 01155050, Connecticut River at Walpole, NH, are considered
equivalent, Water years 1975 to 1980.
