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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
01172010 CONNECTICUT RIVER AT I-391 BRIDGE AT HOLYOKE, MA
LOCATION - Lat 42°11'29.29", long 72°36'33.52" referenced to North American Datum of 1983, Hampden County, MA, Hydrologic Unit 01080201, on right bank, 300 ft above the Interstate 391 bridge behind the flood barrier near water access through wall at river mile 85.
DRAINAGE AREA - 8,332 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 2002 to current year. December 1983 to September 2002 at site 1 mi upstream (station 01172003), records are not equivalent because diversion through canal was not included.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 32.42 ft. above North American Vertical Datum of 1988. Satellite telemetry at station.
COOPERATION - Holyoke Gas and Electric Company.
REMARKS - Water Years 2017-2023: Records good for flows above 30,000 ft³/s, fair for flows between 11,000 - 30,000 ft³/s, and poor for flows less then 11,000 ft³/s and for periods of estimated discharges.
Water Years 2014-2016: Records fair except for periods of low flow conditions, less than 11,000 ft³/s, and periods of estimated daily discharges, which are poor.
Flow regulated by power plants, First Connecticut and Second Connecticut Lakes, Lake Francis, Moore and Comerford Reservoirs, and other reservoirs, combined usable capacity, about 47,000,000,000 ft³.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge since at least 1854, 244,000 ft³/s, Mar. 20, 1936, gage height, 35.0 ft., from floodmarks, at gage located 1.0 mi. upstream.
EXTREMES FOR PERIOD OF RECORD - The highest daily mean discharge of 100,000 ft³/s and maximum peak flow of 107,000 ft³/s occurred on Aug. 29 and 30, 2011.
