USGS Water-Year Summary for Site 01625000

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

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USGS Water-Year Summary 2023

01625000 MIDDLE RIVER NEAR GROTTOES, VA

LOCATION - Lat 38°15'42", long 78°51'44" referenced to North American Datum of 1927, Augusta County, VA, Hydrologic Unit 02070005, on left bank at upstream side of bridge on State Highway 769 at Mount Meridian, 1.8 miles upstream from mouth, and 2.0 miles west of Grottoes.

DRAINAGE AREA - 373 mi².

REVISIONS HISTORY - WSP 1051: 1928-29, 1930(M), 1932, 1935-37, 1938(M), 1940. WSP 1171: 1933. WSP 1302: 1928-29(M), 1931-34(M). OFR 2006-1308: Drainage area. See also PERIOD OF RECORD.

SURFACE-WATER RECORDS

PERIOD OF RECORD - April 1927 to current year. Records for February 1925 to September 1926, published in WSP 601 and 621, are unreliable and should not be used.

GAGE - Water-stage recorder. Datum of gage is 1,060.91 (±0.1) ft above NAVD 88. Prior to Sep. 1, 1938, nonrecording gage at present site and datum.

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

REMARKS - There are discharges of about 6.0 ft³/s from wastewater treatment plants upstream from station. Most of water discharged from treatment plants was diverted from another drainage basin for industrial and municipal supply. Small diurnal fluctuation at low flow caused by mills and irrigation upstream from station. Maximum discharge, 44,300 ft³/s, from rating curve extended above 15,000 ft³/s on basis of slope-area measurement at gage height 33.09 ft.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage since at least 1877, that of Sep. 7, 1996.

WATER-QUALITY RECORDS

PERIOD OF RECORD - December 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, 584 microsiemens/cm, June 6, 2007; minimum, 211 microsiemens/cm, Apr. 29, 2008.
WATER TEMPERATURE: Maximum, 29.7°C, June 9, 2008; minimum, -0.1°C, Jan. 4, 5, 2008.