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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.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
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USGS Water-Year Summary 2024
01204000 POMPERAUG RIVER AT SOUTHBURY, CT
LOCATION - Lat 41°28'54.98", long 73°13'28.46" referenced to North American Datum of 1983, New Haven County, CT, Hydrologic Unit 01100005, on right bank 200 ft upstream from bridge on Poverty Rd., 800 ft downstream from Bullet Hill Brook, 0.6 mi west of Southbury, and 5.8 mi upstream from mouth.
DRAINAGE AREA - 75.1 mi².
REVISIONS HISTORY - WSP 851: 1934(M), 1936(M). WSP 1201: 1933-34, 1935(M), 1937(M). WDR CT-83-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge: June 1932 to current year. Water-quality records: water years 1961, 1965-74. Daily water temperature: water years 1961, 1967. Daily specific conductance: water years 1960-61. Daily pH: water years 1960-61. Daily iron: water years 1960-61.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 165.60 ft above National Geodetic Vertical Datum of 1929, (levels by Corps of Engineers). Satellite telemetry at station.
REMARKS -
Water Years 2014-2016: 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 poor.
Water Year 2019: Records good except June 18 to Aug. 14, which are fair, and periods of estimated discharges, which are poor.
Water Year 2020 - 2023: Records good except for periods of estimated discharges, which are poor.
Ground-water diversions can affect the natural flow regime. Out-of-basin flow diversion for municipal supply for the town of Watertown.
EXTREMES FOR PERIOD OF RECORD - The maximum peak flow of 29,400 ft³/s was obtained from the rating curve extended above 1,200 ft³/s on basis of computation of peak flow over dam at 16.0 ft. and by slope-area measurement of flow. The maximum stage of 21.80 ft. was from flood marks. Minimum instantaneous discharge: 2.5 ft³/s, Aug. 30-31, 1966.
WATER-QUALITY RECORDS
PERIOD OF RECORD - water years 1961, 1965-74.
PERIOD OF DAILY RECORD - Daily water temperature: water years 1961, 1967. Daily specific conductance: water years 1960-61. Daily pH: water years 1960-61. Daily iron: water years 1960-61.
