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Water-Year Summary for Site 01199000

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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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Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2023
LOCATION - Lat 41°57'26", long 73°22'11" referenced to North American Datum of 1927, Litchfield County, CT, Hydrologic Unit 01100005, on left bank at hydroelectric plant of Firstlight Power Resources at Falls Village, 1.4 mi downstream from Hollenbeck River, and at mile 75.9.
DRAINAGE AREA - 634 mi².
REVISIONS HISTORY - WSP 781: Drainage area.
PERIOD OF RECORD - Discharge: July 1912 to current year. Water-quality: water years 1974-80.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 529.06 ft above National Geodetic Vertical Datum of 1929 (levels by Corps of Engineers). Prior to Oct. 26, 1964, at site 0.6 mi downstream at datum 6.72 ft lower. Satellite telemetry at station.
REMARKS - Low flow completely regulated by power plant of Firstlight Power Resources. High flow is regulated by flood-control reservoirs from 20.5 mi² in the Blackberry River Basin, but the regulation does not appreciably affect monthly runoff or the peak flows at the gaging station.
  • Water Year 2020: Records good.
  • Water Year 2018-19: Records fair.
  • Water Year 2017: Records fair.
  • Water Year 2016: Records good except for periods of estimated daily discharges, which are fair.
  • Water Year 2015: Records good except for periods of estimated daily discharges, which are poor.
  • Water Year 2014: Records good except for periods of estimated daily discharges, which are fair.

  • EXTREMES FOR PERIOD OF RECORD - The maximum peak flow was 23,900 ft³/s. Maximum stage of 19.40 ft. was from flood marks at present site and datum. There was practically no instantaneous low flow for many water years at times when the power plant was shut down. Instantaneous low flows are generally the result of regulation.