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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2025
01187800 Nepaug River near Nepaug, CT.
LOCATION - Lat 41°49'14", long 72°58'14" referenced to North American Datum of 1927, Litchfield County, CT, Hydrologic Unit 01080207, on left bank upstream from weir beside State Rte. 202, .25 mi. upstream from Nepaug Reservoir, 1.75 mi. southeast of Nepaug and 2.5 mi. west of Collinsville.
DRAINAGE AREA - 23.5 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge: October 1921 - September 1955, October 1957 - September 1972, October 1998 - September 2001, June 15, 2017 to current year.
GAGE - Water-stage recorder and crest stage gage. Datum of gage is 499.82 ft above NAVD88. Previous datum of gage was 500.54 ft above NGVD29 from 9/26/2023 -6/15/2017, prior to 6/15/2017 datum of gage was 505.54 ft above NGVD29. Satellite telemetry at gage.
COOPERATION - Metropolitan District Commission.
REMARKS -
2022-2023: Records good except for periods of estimated discharges, which are poor.
2020-2021: Records good except for periods of estimated discharges, which are fair.
2019: Records are fair except for periods of estimated discharges, which are poor.
2017 (partial) - 2018: Records good except for periods of estimated discharges, which are fair.
EXTREMES FOR PERIOD OF RECORD - Maximum peak stage of 11.95 ft. on Sep. 2, 2021 during the present datum.
WATER-QUALITY RECORDS
PERIOD OF RECORD - 1962 - 2001, various samples collected.
