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USGS Water-Year Summary 2024
01672500 SOUTH ANNA RIVER NEAR ASHLAND, VA
LOCATION - Lat 37°47'48", long 77°32'57" referenced to North American Datum of 1927, Hanover County, VA, Hydrologic Unit 02080106, on left bank at downstream side of bridge on State Highway 54, 4.5 mi northwest of Ashland, and 7.6 mi upstream from Newfound River.
DRAINAGE AREA - 395 mi².
REVISIONS HISTORY - WSP 801: 1935(M). WSP 1502: 1935, 1939. OFR 2006-1308: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1930 to September 1997, October 2000 to September 2002 (annual maximum only), and June 2003 to current year.
GAGE - Water-stage recorder. Datum of gage is 82.70 ft NAVD of 1988. Prior to Jan. 6, 1997, water-stage recorder at site on right downstream side of old bridge on State Highway 54, at present datum. Jan. 6 to Sept. 30, 1997, at site on right bank, 160 ft downstream, at present datum. June 27, 2003 to current year, at present site and datum.
REMARKS - Since 1966, diversion 150 ft upstream from station has averaged less than 0.6 ft³/s. Capacity of diversion is about 1.5 ft³/s. Maximum discharge, 17,100 ft³/s, from rating curve extended above 12,600 ft³/s. Water-quality records for some prior periods have been collected at this location.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in Aug. 15, 1928 reached a stage of about 24 ft, discharge, about 14,500 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Instantaneous low flow, 0.10 ft³/s, Sept. 12, 1966, caused by diversion upstream from station.
