USGS Water-Year Summary for Site 02011800

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Med.)
	00060 Discharge(Mean)

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

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USGS Water-Year Summary 2023

02011800 JACKSON RIVER BELOW GATHRIGHT DAM, NEAR HOT SPRINGS, VA

LOCATION - Lat 37°56'54", long 79°56'58" referenced to North American Datum of 1927, Alleghany County, VA, Hydrologic Unit 02080201, on right bank 0.4 mi upstream from Cedar Creek, 0.5 mi downstream from Gathright Dam and Lake Moomaw, and 7.3 mi southwest of Hot Springs.

DRAINAGE AREA - 345 mi².

REVISIONS HISTORY - WDR VA-81-1: 1980.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1973 to current year.

GAGE - Water-stage recorder. Datum of gage is 1,399.51 ft NAVD of 1988 (U.S. Army Corps of Engineers bench mark). Prior to Dec. 20, 1973, nonrecording gage, at present site and datum.

REMARKS - Flow regulated since December 1979 by Lake Moomaw (station 02011795) 0.5 mi upstream; since October 1984 by Back Creek Lake 28.5 mi upstream, amount unknown; and since January 1985 by Little Back Creek Lake 31.6 mi upstream, amount unknown. Statistics of monthly mean data and summary statistics for water years 1974-1979 (unregulated flow) are available in previous data books, water years 1991-1998. U.S. Army Corps of Engineers satellite water-temperature and gage-height telemeter at station. Maximum discharge, 29,000 ft³/s, from rating curve extended above 9,140 ft³/s on basis of slope-area measurement of peak flow.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 21, 1972, reached a stage of 17.20 ft, from floodmark.

EXTREMES FOR PERIOD PRIOR TO REGULATION - 1974-79: Maximum peak flow, 29,000 ft³/s, Dec. 26, 1973, result of cofferdam failure during construction of Gathright Dam, gage height, 18.77 ft. Instantaneous low flow, 3.0 ft³/s, July 12, 1979, result of gate closure at Gathright Dam.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1978 to current year.

PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: October 1978 to September 2001.
pH: October 1978 to September 2001.
SPECIFIC CONDUCTANCE: October 1978 to September 2001.
WATER TEMPERATURE: October 1978 to current year.

INSTRUMENTATION - Water temperature monitor with 15-minute recording interval. Water-quality monitor October 1978 to September 2001.

EXTREMES FOR PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: Maximum, 19.5 mg/l, Jan.16, 1979; minimum, 5.7 mg/l, Aug. 1, 3, 1987.
pH: Maximum, 9.3 standard units, Jan. 19, 20, 1996; minimum, 6.3 standard units, May 18, 1996.
SPECIFIC CONDUCTANCE: Maximum 249 microsiemans/cm, Nov. 5, 1985; minimum, 78 microsiemans/cm, May 14, 1979.
WATER TEMPERATURE: Maximum, 28.0°C, Aug. 1, 2, 1979, but may have been higher during periods of missing record; minimum, 0.0°C, Feb. 16-19, 1979.