USGS Water-Year Summary for Site 02025500

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

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USGS Water-Year Summary 2023

02025500 JAMES RIVER AT HOLCOMB ROCK, VA

LOCATION - Lat 37°30'04", long 79°15'46" referenced to North American Datum of 1927, Bedford County, VA, Hydrologic Unit 02080203, on right bank at Holcomb Rock, 0.9 mi downstream from Pedlar River, and at mile 268.6.

DRAINAGE AREA - 3,256 mi².

REVISIONS HISTORY - WSP 972: 1913(M), 1932-33, 1935(M), 1936. WSP 1303: 1928(M). OFR 2006-1308: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - January 1900 to September 1915 (gage heights only), April 1927 to current year. Monthly discharge only for some periods, published in WSP 1303. Published as "at Salt Creek" December 1926 to June 1931 and as "at Holcombs Rock" June 1931 to September 1990.

GAGE - Water-stage recorder. Datum of gage is 547.83 ft NAVD of 1988. January 1900 to September 1915, nonrecording gage in powerhouse of Owens Illinois Glass Company 1,000 ft upstream at different datum. December 1926 to June 1931, water-stage recorder at site 2 mi downstream at different datum.

REMARKS - Some diurnal fluctuation caused by powerplants upstream from station. Flow regulated since December 1979 by Lake Moomaw (station 02011795) 117.4 mi upstream; since October 1984 by Back Creek Lake 145.4 mi upstream; and since January 1985 by Little Back Creek Lake 148.5 mi upstream, amount unknown. Statistics of monthly mean data and summary statistics for water years 1927 - 1979 (unregulated flow) are available in previous data books, water years 1991 - 1998. National Weather Service gage-height telemeter at station. Maximum discharge, 208,000 ft³/s, from rating curve extended above 130,000 ft³/s on basis of records for other stations in James River Basin.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood in March 1913 reached a stage of 31.3 ft, from floodmarks, discharge, about 118,000 ft³/s.

EXTREMES FOR PERIOD PRIOR TO REGULATION - 1927-79: Maximum peak flow, 150,000 ft³/s, Aug. 20, 1969, gage height, 35.50 ft. Instantaneous low flow, 71 ft³/s, Oct. 24, 1963.

WATER-QUALITY RECORDS

PERIOD OF RECORD - October 2006 to November 2008.

PERIOD OF DAILY RECORD - February 2007 to November 2008.

INSTRUMENTATION - Specific conductance and water temperature monitor. Electronic data logger with 15-minute recording interval.

EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum, 618 microsiemens/cm, Mar. 28, 2007; minimum, 49 microsiemens/cm, May 7, 2008.
WATER TEMPERATURE: Maximum, 31.8°C, Aug. 8, 10, 11, 2007; minimum, 0.8°C, Jan. 25, 2008.