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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2025
01646305 DEAD RUN AT WHANN AVENUE NEAR MCLEAN, VA
LOCATION - Lat 38°57'34.8", long 77°10'33.5" referenced to North American Datum of 1927, Fairfax County, VA, Hydrologic Unit 02070008, on right bank, at bottom of ridge at end of Whann Avenue.
DRAINAGE AREA - 2.05 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - January 2008 to current year.
GAGE - Water-stage recorder. Datum of Gage 177.2 ft NAVD of 1988
WATER-QUALITY RECORDS
PERIOD OF RECORD - November 2007 to current year.
PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: March to September 2012.
pH: November 2007 to current year.
SPECIFIC CONDUCTANCE: November 2007 to current year.
TURBIDITY: November 2007 to current year.
WATER TEMPERATURE: November 2007 to current year.
DISSOLVED OXYGEN: March to September 2012.
pH: November 2007 to current year.
SPECIFIC CONDUCTANCE: November 2007 to current year.
TURBIDITY: November 2007 to current year.
WATER TEMPERATURE: November 2007 to current year.
INSTRUMENTATION - Water-quality monitor. Electronic data logger with 15-minute recording interval.
EXTREMES FOR PERIOD OF DAILY RECORD -
DISSOLV:
ED OXYGEN: Maximum: 18.3 mg/L, Feb. 20, 2015, but may have been higher during periods of missing record; minimum: 3.8 mg/L, May 17, 2015, but may have been lower during periods of missing record.
pH: Maximum: 8.9 standard units, Apr. 18, 2008, but may have been higher during periods of missing record; minimum: 5.6 standard units, May 31, 2008, but may have been lower during periods of missing record.
SPECIFIC CONDUCTANCE: Maximum: 13,400 microsiemens/cm, Jan. 28, 2009, but may have been higher during periods of missing record; minimum: 18 microsiemens/cm, Dec. 1, 2010, but may have been lower during periods of missing record.
TURBIDITY: Maximum: 1,710 FNU, Apr. 20, 2008, but may have been higher during periods of missing record; minimum: 0.0 FNU, on many days.
WATER TEMPERATURE: Maximum: 29.0 °C, July 25, 2010, but may have been higher during periods of missing record; minimum: -0.3 °C, Feb. 22, Mar. 7, 2015.
DISSOLV:
ED OXYGEN: Maximum: 18.3 mg/L, Feb. 20, 2015, but may have been higher during periods of missing record; minimum: 3.8 mg/L, May 17, 2015, but may have been lower during periods of missing record.
pH: Maximum: 8.9 standard units, Apr. 18, 2008, but may have been higher during periods of missing record; minimum: 5.6 standard units, May 31, 2008, but may have been lower during periods of missing record.
SPECIFIC CONDUCTANCE: Maximum: 13,400 microsiemens/cm, Jan. 28, 2009, but may have been higher during periods of missing record; minimum: 18 microsiemens/cm, Dec. 1, 2010, but may have been lower during periods of missing record.
TURBIDITY: Maximum: 1,710 FNU, Apr. 20, 2008, but may have been higher during periods of missing record; minimum: 0.0 FNU, on many days.
WATER TEMPERATURE: Maximum: 29.0 °C, July 25, 2010, but may have been higher during periods of missing record; minimum: -0.3 °C, Feb. 22, Mar. 7, 2015.
