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Water-Year Summary for Site 01121000

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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 2020: 2019-10-01 to 2020-09-30

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USGS Water-Year Summary 2020
LOCATION - Lat 41°50'37", long 72°10'10" referenced to North American Datum of 1927, Windham County, CT, Hydrologic Unit 01100002, on left bank 250 ft downstream from Knowlton Brook, 700 ft upstream from bridge on State Rte. 89, 1.8 mi south of Warrenville, and 3.2 mi southwest of Ashford.
DRAINAGE AREA - 28.6 mi².  
REVISIONS HISTORY - WSP 1331: 1941, 1951-53 (M). WSP 1721: Drainage area. WDR CT-75-1: 1974 (P).
PERIOD OF RECORD - Discharge: October 1940 to current year. Chemical Analyses: available for water year 1959 (WSP 1641).
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 334.70 ft above North American Vertical Datum of 1988 (335.68 ft above National Geodetic Vertical Datum of 1929). Satellite telemetry at station.

Occasional regulation from ponds upstream.

Water Year 2019: Records good except for periods of estimated discharge, which are poor.

Water Year 2018: Records good except for periods of estimated daily discharges, which are fair.

Water Years 2014-2017: Records good except for periods of estimated daily discharges, which are poor.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of September 1938 reached a stage of about 14.5 ft, from flood marks.
EXTREMES FOR PERIOD OF RECORD - The maximum peak flow of 5,590 ft³/s was obtained from the rating curve extended above 890 ft³/s on basis of contracted-opening measurement of peak flow. The maximum stage of 10.41 ft. was from flood marks in gage well.