USGS Water-Year Summary for Site 01200500

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	Available Parameters
	00060 Discharge(Mean)
	00065 Gage height(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

01200500 HOUSATONIC RIVER AT GAYLORDSVILLE, CT

LOCATION - Lat 41°39'11", long 73°29'25" referenced to North American Datum of 1927, Litchfield County, CT, Hydrologic Unit 01100005, on left bank 0.4 mi downstream from hydroelectric plant of Connecticut Light and Power Co., 0.5 mi upstream from bridge on U.S. Rt. 7 at Gaylordsville, 1.5 mi downstream from Tenmile River, and at mile 50.6.

DRAINAGE AREA - 996 mi².

REVISIONS HISTORY - WDR CT-83-1: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Discharge: July 1940 to current year. October 1900 to December 1904 (fragmentary), January 1905 to December 1908 (gage heights only), January 1909 to December 1912 (fragmentary), January 1913 to October 1914 (gage heights only), November 1914 (fragmentary). Water-quality records: water years 1960, 1968. Daily water temperature: water years 1960, 1968. Daily suspended-sediment discharge: water years 1979-80.

GAGE - Water-stage recorder/transmitter and crest-stage gage. Datum of gage is 236.78 ft above National Geodetic Vertical Datum of 1929. October 1900 to November 1914, nonrecording gage on covered bridge 0.6 mi downstream at different datum.

REMARKS -

Ordinary flow regulated by power plant upstream. High flow is regulated by flood-control reservoirs in 20.5 mi² of the Blackberry River Basin, but flood control does not appreciably affect monthly runoff or the peak flows at the gaging station. Lowest daily mean of 60 ft³/s also occurred on Sep. 20, 1949.

Water Year 2016-2022: Records good except for periods of estimated discharges, which are fair.
Water Year 2014-2015: Records good except for periods of estimated discharges, which are poor.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood in May 1854 reached a stage of 21 ft 3 in, former site and datum; reported by observer in 1902. Flood of Sept. 22, 1938, reached a stage of 14.5 ft, from floodmarks, at present site, discharge, 37,000 ft³/s, by computation of peak flow over dam 2.5 mi upstream adjusted for flow from intervening area.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1960, 1968.

PERIOD OF DAILY RECORD - Daily water temperature: water years 1960, 1968. Daily suspended-sediment discharge: water years 1979-80.