Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

Click to hideNews Bulletins

Water-Year Summary for Site 01186000

Click to hide Water-Year Summary instructions and information
  • 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 2023: 2022-10-01 to 2023-09-30

Print this page
USGS Water-Year Summary 2023
LOCATION - Lat 41°57'46", long 73°01'05" referenced to North American Datum of 1927, Litchfield County, CT, Hydrologic Unit 01080207, on right bank at downstream side of bridge on State Rt. 20 at Riverton, 0.3 mi upstream from Still River, 2.0 mi downstream from Goodwin Dam of West Branch Reservoir, and at mile 55.
DRAINAGE AREA - 131 mi².
REVISIONS HISTORY - WSP 1501: 1956. WSP 1551: 1957. WSP 1701: 1958-59.
PERIOD OF RECORD - Discharge: August 1955 to current year. Water-quality records: water years 1954, 1955, 1975-80.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 485.60 ft above National Geodetic Vertical Datum of 1929. Prior to Mar. 29, 1957, non-recording gage at same site and datum. Telephone telemetry at station. Satellite telemetry at station.

Peak flows are affected by flood-control regulation from Colebrook River Lake since 1969. The natural flow regime can be altered by regulation at Otis Reservoir, Colebrook River Lake, and West Branch Reservoir.

  • Water Year 2022: Records fair.
  • Water Year 2021: Records good.
  • Water Year 2020: Records good except for periods of estimated discharges, which are fair.
  • Water Year 2018- 2019: Records good except for periods of estimated discharges, which are fair.
  • Water Year 2015- 2017: Records good.
  • Water Year 2014: Records good except for periods of estimated daily discharges, which are fair.

  • EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Aug. 19, 1955, reached a stage of 21.1 ft, from floodmarks, discharge, 57,200 ft³/s, by slope-area measurement 1.5 mi upstream.
    PERIOD OF DAILY RECORD - In-situ monitoring of Water Temperature, June 2019 to current year.
    EXTREMES FOR PERIOD OF DAILY RECORD - --WATER TEMPERATURE: Maximum, 22.4°C on Aug. 21, 2021; minimum, 0.4°C on Feb. 25, 2022.