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Water-Year Summary for Site 011230695

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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.
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Available Parameters
00060 Discharge(Mean)  

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

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USGS Water-Year Summary 2020
LOCATION - Lat 41°34'12.01", long 72°02'46.48" referenced to North American Datum of 1983, New London County, CT, Hydrologic Unit 01100002, on right bank at Ponemah Mills, 900 ft. upstream from Rte. 169 bridge, .9 mi. upstream of confluence with Quinebaug River, at Taftville, CT.
DRAINAGE AREA - 512 mi².
PERIOD OF RECORD - Discharge: October 1989 to March 1997, March 2001 to September 2001, October 2007 to current year.
GAGE - Water-stage recorder. Datum of gage is 19.12 ft above National Geodetic Vertical Datum of 1929. Satellite telemetry at station.
REMARKS - Flow regulated by mills and flood detention reservoirs on Willimantic River, on Natchaug River by pumping for municipal supply for city of Willimantic, by Mansfield Hollow Dam, and by power regulation at Taftville Dam 0.2 mi upstream.
  • Water Year 2018-2019: Records good except for periods of estimated discharge, which are fair.
  • Water Year 2015-2017: Records good.
  • Water Year 2014: Records good except for periods of estimated daily discharges, which are poor.

  • EXTREMES FOR PERIOD OF RECORD - The maximum peak stage of 16.05 ft. on March 31, 2010 was affected by backwater from confluence with Quinebaug River downstream of gage. The instantaneous low flow of 21 ft³/s on Sep. 25, 1993 was the result of regulation from Taftville Dam 0.2 mi. upstream.
    PERIOD OF RECORD - March 2001 to September 2001, October 2007 to current year.