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USGS Water-Year Summary 2024
390623077314201 50W 4C
Early Mesozoic basin aquifers
Balls Bluff Formation
Balls Bluff Formation
LOCATION - Lat 39°06'23", long 77°31'42" referenced to North American Datum of 1927, Loudoun County, VA, Hydrologic Unit 02070008, near water towers 0.7 miles east of Rt 15 N/Leesburg Bypass, near Fort Evans Rd.
GROUNDWATER RECORDS
DATUM - Land-surface datum is 383.49 ft above North American Vertical Datum of 1988. Measuring point: TOP OF SHELF, 2.07 ft above land-surface datum, Jul. 20, 2006 to present.
PERIOD OF RECORD - October 1977 to current year.
GAGE - Electronic data logger and pressure transducer, 15-minute record interval. Prior to July 25, 2006, occasional measurement with chalked tape by USGS personnel.
REMARKS - Well is located in slightly metamorphosed Balls Bluff Formation of Late Triassic age. Water level affected by magnitude 5.8 Mineral, VA earthquake on Aug. 23, 2011.
EXTREMES FOR PERIOD OF RECORD - Highest water level recorded, 18.89 ft below land-surface datum, May 15, 2010; lowest measured, 49.06 ft below land-surface datum, Nov. 27, 1985.
