USGS Water-Year Summary 2023

02028500 ROCKFISH RIVER NEAR GREENFIELD, VA

LOCATION - Lat 37°52'10", long 78°49'25" referenced to North American Datum of 1927, Nelson County, VA, Hydrologic Unit 02080203, on left bank 50 ft downstream from bridge on State Highway 634, 2.8 mi downstream from confluence of North and South Forks, and 4.1 mi south of Greenfield.

DRAINAGE AREA - 94.8 mi².

REVISIONS HISTORY - OFR 2006-1308: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - April 1943 to current year.

GAGE - Water-stage recorder. Datum of gage is 527.638 ± 0.1 ft above NAVD 88. Prior to Sept 22, 2021, datum at 532.29 ft NGVD of 1929. Prior to Nov. 3, 2009, at datum of 530.29 ft. Prior to Aug. 21, 1943, nonrecording gage at present site.

COOPERATION - Records were provided by the Virginia Department of Environmental Quality - Water Division.

REMARKS - Maximum discharge, 70,000 ft³/s, from rating curve extended above 8,500 ft³/s on basis of contracted-opening measurement at gage height 18.11 ft, slope-area measurements at gage heights 17.2 ft, 23.4 ft, and 31.2 ft, and peak runoff comparison with nearby stations. Water-quality records for some prior periods have been collected at this location.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Oct. 15, 1942, reached a stage of 23.4 ft, from floodmarks, discharge, about 30,000 ft³/s.