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USGS Water-Year Summary 2024
01667500 RAPIDAN RIVER NEAR CULPEPER, VA
LOCATION - Lat 38°21'01", long 77°58'31" referenced to North American Datum of 1927, Culpeper County, VA, Hydrologic Unit 02080103, on left bank 0.7 mi upstream from Cedar Run and bridge on US Highway 522, 8.5 miles south of Culpeper, Culpeper County, and at mile 29.6.
DRAINAGE AREA - 468 mi².
REVISIONS HISTORY - WSP 741: 1931. WSP 801: 1934(M), 1936(M). WSP 1081: 1943-46. WSP 1171: 1932(M), 1933-35. OFR 2006-1308: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1930 to current year. Monthly discharge only for some periods, published in WSP 1302.
GAGE - Water-stage recorder. Datum of gage is 240.31 ± 0.1 ft above NAVD 88.
COOPERATION - Records were provided by the Virginia Department of Environmental Quality - Water Division.
REMARKS - Prior to 1977, diurnal fluctuation at low flow caused by mill at Rapidan, and since July 1986, by powerplant at same site. National Weather Service gage-height telemeter at station. Maximum discharge, 59,300 ft³/s, from rating curve extended above 43,000 ft³/s on basis of slope-area measurement at gage height 30.26 ft.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1945 to 1946, 1951 to 1956, 1968, 1969, and 2004 to current year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: October 1952 to September 1956, October 2006 to October 2008.
SUSPENDED SEDIMENT DISCHARGE: April 1951 to September 1956.
WATER TEMPERATURE: October 1945 to September 1946, April 1951 to September 1956, October 2006 to October 2008.
SPECIFIC CONDUCTANCE: October 1952 to September 1956, October 2006 to October 2008.
SUSPENDED SEDIMENT DISCHARGE: April 1951 to September 1956.
WATER TEMPERATURE: October 1945 to September 1946, April 1951 to September 1956, October 2006 to October 2008.
COOPERATION - Daily records for 2006 to 2008 were provided by the Virginia Department of Environmental Quality - Water Division.
EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum, 361 microseimens/cm, Nov. 16, 2006; minimum, 34 microseimens/cm, Mar. 24 to Apr. 5 and Apr. 11-13, 1953.
SUSPENDED SEDIMENT DISCHARGE: Maximum calculated, 22,600 tons/day, Aug. 18, 1955; minimum 0.0 tons/day, many days.
WATER TEMPERATURE: Maximum, 37.7°C, Aug. 9, 1951; minimum, -0.3°C, Feb. 10, 14, 15, 18, 2007.
SPECIFIC CONDUCTANCE: Maximum, 361 microseimens/cm, Nov. 16, 2006; minimum, 34 microseimens/cm, Mar. 24 to Apr. 5 and Apr. 11-13, 1953.
SUSPENDED SEDIMENT DISCHARGE: Maximum calculated, 22,600 tons/day, Aug. 18, 1955; minimum 0.0 tons/day, many days.
WATER TEMPERATURE: Maximum, 37.7°C, Aug. 9, 1951; minimum, -0.3°C, Feb. 10, 14, 15, 18, 2007.
