USGS Water-Year Summary for Site 02079500

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Med.,Mean)
	00065 Gage height(Max.,Min.)
	00095 Specific cond at 25C(Min.,Mean,Med.,Max.)
	00300 Dissolved oxygen(Max.,Mean,Med.,Min.)
	00400 pH(Med.,Min.,Max.)

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

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USGS Water-Year Summary 2023

02079500 ROANOKE RIVER AT BUGGS ISLAND, VA

LOCATION - Lat 36°36'11", long 78°17'53" referenced to North American Datum of 1927, Mecklenburg County, VA, Hydrologic Unit 03010106, on left bank 1,200 ft downstream from John H. Kerr dam, 5.3 mi upstream from bridge on U.S. Highway 1, 6.7 mi southeast of Boydton, and at mile 178.4.

DRAINAGE AREA - 7,866 mi².

REVISIONS HISTORY - OFR 2006-1308: Drainage area. WDR-VA-12: 2010-11.

SURFACE-WATER RECORDS

PERIOD OF RECORD - November 1921 to August 1923 (gage heights only), April 1947 to September 1962, October 1963 to September 2000 (annual maximum only), October 2000 to current year (gage heights only).

GAGE - Water-stage recorder. Datum of gage is 195.28 ft (+/- 0.13) above NAVD 88. The NAVD 1988 datum was determined by a level 2 GNSS survey (Reference Frame NAD_83 (2011) (EPOCH:2010.0000), GEOID18) by USGS on September 27, 2022 and tied to the datum through RM-8. Prior to September 27, 2022 datum of the gage was reported as 196.72 ft NGVD of 1929. November 1921 to August 1923, at site 0.3 mi upstream at different datum. April 1947 to Sept. 30, 1952, at site 2,800 ft downstream at different datum.

REMARKS - Since July 1950, flow regulated by John H. Kerr reservoir (station 02079490) 1,200 ft upstream.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 76,000 ft³/s, Dec 7, 1948, gage height, 14.97 ft. at datum then in use.

WATER-QUALITY RECORDS

PERIOD OF RECORD - December 2003 to current year.

PERIOD OF DAILY RECORD - December 2003 to current year.

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

EXTREMES FOR PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: Maximum, 14.9 mg/L, Mar. 28, 2007, but may have been higher during periods of missing record; minimum, 0.0 mg/L, Apr. 6, 2004.
pH: Maximum, 9.8 standard units, Mar. 23, 2008, but may have been higher during periods of missing record; minimum, 5.2 standard units, July 26, 27, 2010, but may have been lower during periods of missing record.
SPECIFIC CONDUCTANCE: Maximum, 185 microsiemens, Oct. 8, 2007, but may have been higher during periods of missing record; minimum, 66 microsiemens, Feb. 27, 2004, but may have been lower during periods of missing record.
WATER TEMPERATURE: Maximum, 27.7°C, Aug. 28, 2016, but may have been higher during periods of missing record; minimum, 2.8°C, Feb. 26, 2015, but may have been lower during periods of missing record.