USGS Water-Year Summary 2024

01628500 SOUTH FORK SHENANDOAH RIVER NEAR LYNNWOOD, VA

LOCATION - Lat 38°19'21", long 78°45'18" referenced to North American Datum of 1927, Rockingham County, VA, Hydrologic Unit 02070005, on left bank 1.2 mi northeast of Lynnwood and 3.3 mi downstream from confluence of North and South Rivers.

DRAINAGE AREA - 1,079 mi².

REVISIONS HISTORY - WSP 1171: 1933(M). OFR 2006-1308: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1930 to current year.

GAGE - Water-stage recorder. Datum of gage is 1,001.74 ft NAVD of 1988.

COOPERATION - Records prior to July 1, 2012 were provided by the Virginia Department of Environmental Quality - Water Division.

REMARKS - Diurnal fluctuation at low flow prior to 1960 caused by mill at Lynnwood and since by irrigation. National Weather Service rain gage and gage-height telemeters and Virginia Department of Emergency Services gage-height radio transmitter at station. Maximum discharge, 107,000 ft³/s, from rating curve extended above 22,000 ft³/s on basis of computations of flow over dam at gage heights 23.60 ft and 27.2 ft.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since at least 1870, that of Sept. 7, 1996.

WATER-QUALITY RECORDS

PERIOD OF RECORD - August 2009 to September 2010, October 2011 to September 2012.

PERIOD OF DAILY RECORD - August to 2009 to September 2010.

INSTRUMENTATION - Water temperature monitor. Electronic data logger with 15-minute recording interval.

EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Maximum, 29.3°C, July 8, 2010; minimum, -0.2°C, Jan. 10, 2010.