USGS Water-Year Summary for Site 01654000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Med.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Med.)
	00300 Dissolved oxygen(Max.,Min.,Med.)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Max.,Min.,Med.)
	99133 NO3+NO2,water,insitu(Med.,Max.,Min.)

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

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USGS Water-Year Summary 2023

01654000 ACCOTINK CREEK NEAR ANNANDALE, VA

LOCATION - Lat 38°48'46", long 77°13'43" referenced to North American Datum of 1927, Fairfax County, VA, Hydrologic Unit 02070010, on left bank 800 ft upstream from bridge on State Highway 620, 0.2 mi upstream from Long Branch, and 2.3 mi southwest of Annandale.

DRAINAGE AREA - 23.9 mi².

REVISIONS HISTORY - WSP 1502: 1952. WSP 2103: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1947 to current year.

GAGE - Water-stage recorder.
Datum of gage is 190.6 ft. NAVD of 1988. Prior to May 12, 1949, nonrecording gage at site 800 ft downstream at datum of 190.91 ft NGVD of 1929. May 12, 1949, to June 4, 1970, water-stage recorder at site 800 ft downstream at datum of 190.91 ft NGVD of 1929.

COOPERATION - Records prior to Oct. 1, 2011 were provided by the Virginia Department of Environmental Quality - Water Division.

WATER-QUALITY RECORDS

PERIOD OF RECORD - April 1993 to August 1995, September 1997 to September 2006, October 2007 to September 2008, and October 2009 to current year.

PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: February 2015 to current year.
NITRATE: October 2015 to current year. pH: February 2015 to current year.
TURBIDITY: February 2015 to current year.
SPECIFIC CONDUCTANCE: January 2002 to September 2004, February 2015 to current year.
WATER TEMPERATURE: January 2002 to September 2004, February 2015 to current year.

INSTRUMENTATION - Water-quality and nitrate monitors. Electronic data logger with 15-minute recording interval.

EXTREMES FOR PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: Maximum: 15.7 mg/L, Mar. 25, 2015, but may have been higher during periods of missing record; minimum, 4.4 mg/L, Sept. 9, 2015, but may have been lower during periods of missing record.
NITRATE: Maximum: 1.39 mg/L as N, Feb. 14, 2016, but may have been higher during periods of missing record; minimum: 0.12 mg/L as N, Nov. 5, 6, 2015, but may have been lower during periods of missing record.
pH: Maximum: 8.8 standard units, Apr. 2, 6, 2015, but may have been higher during periods of missing record; minimum: 6.1 standard units, Sept. 30, 2015, but may have been lower during periods of missing record.
TURBIDITY: Maximum: 1,220 FNU, Apr. 14, 2015, but may have been higher during periods of missing record; minimum: 0.0 FNU, Feb. 19, 2015, but may have been lower during periods of missing record.
SPECIFIC CONDUCTANCE: Maximum, 11,000 microsiemens/cm (road salt influence), Feb. 22, 2015, but may have been higher during periods of missing record; minimum, 46 microsiemens/cm, June 27, 2015, but may have been lower during periods of missing record.
WATER TEMPERATURE: Maximum, 28.8°C, Aug. 24, 2002, but may have been higher during periods of missing record; minimum, -0.2°C, Feb. 22, Mar. 1, 2015, but may have been lower during periods of missing record.