USGS Water-Year Summary for Site 02073000

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	Available Parameters
	00010 Temperature, water(Mean,Med.)
	00060 Discharge(Mean)

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

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USGS Water-Year Summary 2023

02073000 SMITH RIVER AT MARTINSVILLE, VA

LOCATION - Lat 36°39'40", long 79°52'51" referenced to North American Datum of 1927, Henry County, VA, Hydrologic Unit 03010103, On right bank at south edge of Martinsville, 800 ft downstream from bridge on U.S. Highways 58 and 220, and 5.0 mi downstream from Beaver Creek.

DRAINAGE AREA - 379 mi².

REVISIONS HISTORY - WSP 1032: 1933-35(M), 1936-39, 1940-41(P). OFR 2006-1308: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - August 1929 to current year.

GAGE - Water-stage recorder. Datum of gage is 657.22 ft NGVD of 1929.

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

REMARKS - Flow regulated since August 1950 by Philpott Lake (station 02071900) 19.6 mi upstream from station. Some additional regulation by powerplant 1,000 ft upstream from station. Statistics of monthly mean data and summary statistics for water years 1930-1950 (unregulated flow) are available in previous data books, water years 1991-1998. Maximum discharge, 39,000 ft³/s, from rating curve extended above 17,000 ft³/s on basis of computations of flow over dam at gage heights 16.76 ft and 21.50 ft.

EXTREMES FOR PERIOD PRIOR TO REGULATION - 1930-50: Maximum peak flow, 39,000 ft³/s, Oct. 19, 1937, gage height, 21.50 ft. Instantaneous low flow, 5.0 ft³/s, May 20, 1934.

WATER-QUALITY RECORDS

PERIOD OF RECORD - November 2006 to September 2008.

PERIOD OF DAILY RECORD - March 2007 to September 2008.

COOPERATION - Daily records were provided by the Virginia Department of Environmental Quality - Water Division

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

EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum, 360 microsiemens/cm, Dec. 8, 2007; minimum, 20 microsiemens/cm, Mar. 11, 12, 2008.
WATER TEMPERATURE: Maximum, 26.7°C, Sept. 1, 2007; minimum, 1.5°C, Jan. 21, 2008.