USGS Water-Year Summary for Site 01205500

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	Available Parameters
	00010 Temperature, water(Mean,Max.,Min.)
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Min.,Max.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00301 Diss oxygen,%saturtn(Min.,Max.,Mean)
	00400 pH(Min.,Max.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

01205500 HOUSATONIC RIVER AT STEVENSON, CT

LOCATION - Lat 41°23'01.69", long 73°09'59.90" referenced to North American Datum of 1983, New Haven County, CT, Hydrologic Unit 01100005, on left bank, 0.2 mi downstream from dam of First Light Power Resources at Stevenson, Fairfield County, 0.2 mi upstream from Eightmile Brook, and at mile 19.2.

DRAINAGE AREA - 1,544 mi².

REVISIONS HISTORY - WSP 711: 1929(M). WSP 1231: 1951. WSP 1301: 1933-34(M), 1936-37. WDR CT-83-1: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - August 1928 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 24.98 ft above National Geodetic Vertical Datum of 1929 (levels by Corps of Engineers) (23.66 ft above North American Vertical Datum of 1988). Satellite telemetry at station.

REMARKS -

Water Years 2014 - 2023: Records good.

EXTREMES FOR PERIOD OF RECORD - The maximum peak flow of 75,800 ft³/s was obtained from the rating curve extended above 35,000 ft³/s on basis of computation of peak flow at Stevenson and Derby Dams and slope-area measurement at gage heights 21.5 and 23.5 ft. The maximum peak stage of 24.5 ft. was from flood marks. Minimum discharge: practically no flow at times, the result of regulation.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1952-53, 1955-56, 1959, 1961, 1963, 1968 to current year.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: November 1974 to September 1981. WATER TEMPERATURES: November 1974 to September 1981.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum recorded, 390 microsiemens Sept. 14, 1977; minimum recorded, 46 microsiemens Mar. 25, 1980. WATER TEMPERATURES: Maximum recorded, 30.5°C Aug. 3, 6-9, 1976; minimum, 0.0°C many days during the winter period.