--Lat 39°18'37.1", long
76°47'32.7", Baltimore County, MD, Hydrologic Unit 02060003,
on left bank at upstream side of highway bridge at Hollofield, 0.3 mi
downstream from Dogwood Run, 3.0 mi north of Ellicott City, and 28 mi
upstream from mouth.
PERIOD OF RECORD.
--May 1944 to January 1992, March 1994 to
September 1995, January 2000 to September 2004, April 2010 to current
REVISIONS HISTORY (WATER
--Water stage recorder and crest-stage gage. Datum of gage
is 186.9 ft above North American Vertical Datum of 1988, from digital
elevation model. Prior to May 1, 2010, at site on downstream side of
bridge at same gage datum. Prior to June 22, 1972, water-stage recorder
at site on opposite bank at same gage datum.
--Flow regulated by Liberty Reservoir, 11 mi upstream,
beginning July 22, 1954, usable capacity, 42,070,000,000 gal; dead
storage, 1,260,000,000 gal. Diversions upstream from station for
municipal supply of Westminster (sewage effluent discharged into Little
Pipe Creek), and from Liberty Reservoir beginning Feb. 26, 1953, for
municipal supply of Baltimore, and beginning February 1970 for a small
municipal supply for part of Carroll County. U.S. Geological Survey
satellite data-collection platform at station. EXTREMES FOR PERIOD
--Maximum discharge, 80,600 ft3
/s, June 22,
1972, gage height, 31.30 ft; minimum discharge, 5.7 ft3
Aug. 22, 23, 2002.
--Funding for the operation of this station is
provided by the Baltimore County Department of Environmental Protection
& Sustainability and the U.S. Geological Survey.