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Water-Year Summary for Site 01122000

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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.
Available Parameters
00060 Discharge(Mean)  
00065 Gage height(Mean)  

Water year 2022: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2022
LOCATION - Lat 41°43'12.36", long 72°11'44.07" referenced to North American Datum of 1983, Windham County, CT, Hydrologic Unit 01100002, on left bank at upstream side of bridge on State Rt. 66, 1 mi northeast of Willimantic, 1.6 mi upstream from mouth, and 3.7 mi downstream from Mansfield Hollow Dam.
DRAINAGE AREA - 174 mi².
REVISIONS HISTORY - WSP 1301: 1934-35 (M), 1937 (M). WDR CT-83-1: Drainage area.
PERIOD OF RECORD - Discharge: October 1930 to September 1989, October 1995 to current year. Water-quality records: water years 1954, 1958, 1968.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 150.31 ft above National Geodetic Vertical Datum of 1929 (levels by Corps of Engineers). Oct. 6, 1930, to June 6, 1974, water-stage recorder on right bank 500 ft upstream at same datum. June 6, 1974 to Aug. 26, 1975, staff gage at present site and datum. Telephone telemetry at station. Satellite telemetry at station.

Water Years 2014 - 2019: Records good except for periods of estimated discharges, which are poor.

Water Year 2020: Records fair.

Peak flows are affected by flood-control regulation at Mansfield Hollow Dam since March 1952. The natural flow regime can be altered by regulation from Mansfield Hollow Dam and Willimantic Reservoir. City of Willimantic diverts flow for municipal supply from Willimantic Reservoir, which is located about 2 mi upstream from the gaging station.
EXTREMES FOR PERIOD OF RECORD - The maximum peak flow of 32,000 ft³/s was from computation of peak flow over dam 2 mi upstream. The maximum stage of 16.39 ft. was from flood marks.