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USGS Water-Year Summary 2024
01188090 FARMINGTON RIVER AT UNIONVILLE, CT
LOCATION - Lat 41°45'19.97", long 72°53'13.35" referenced to North American Datum of 1983, Hartford County, CT, Hydrologic Unit 01080207, at right bank upstream from steel truss highway bridge on State Rt. 177 at Unionville, 4.1 mi downstream from Bunnell Brook and 3.0 mi upstream from Pequabuck River.
DRAINAGE AREA - 378 mi².
REVISIONS HISTORY - WDR US-11-01: 2007 (P, DV).
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1977 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 178.20 ft above National Geodetic Vertical Datum of 1929. Satellite telemetry at station.
REMARKS - Water Years 2019-2023: Records good except for periods of estimated discharges, which are fair.
Water Years 2017-2018: Records good except for periods of estimated discharges, which are fair.
Water Year 2014 - 2016: Records good except for periods of estimated daily discharges, which are fair.
Peak flows are affected by flood-control regulation at Colebrook River Lake, Highland Lake Reservoir, Sucker Brook Dam, and Mad River Reservoir. The natural flow regime can be altered by regulation from water-supply reservoirs (Barkhamsted, Lake McDonough, East Branch, Nepaug, and West Branch), flood-control reservoirs (Colebrook River Lake, Highland Lake Reservoir, Sucker Brook Dam, and Mad River Reservoir), and by Otis Reservoir.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Aug. 19, 1955 reached a stage of 32.9 ft from floodmark; discharge, 140,000 ft³/s, by slope-area measurement 3.8 mi upstream.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1977-80, 1984 to current year.
REMARKS - Water-quality records for this site published under station 01188085 from water year 1984 to water year 1990.
