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NOTICE (10/01/2021) -- Water quality data collection at this streamgage was discontinued on 09/30/2021.
Although historic data will remain accessible, no new data will be collected unless one or more new funding partners are found.
Potential funding partners or general questions concerning continuance of operations may contact Chuck Walker (cwwalker@usgs.gov;443-498-5523).

LOCATION.--Lat 39°13'38.4", long 76°43'22.8", Baltimore County, MD, Hydrologic Unit 02060003,
   on left bank 50 ft upstream from bridge on Gun Road, in Patapsco Valley State Park, 0.9 mi 
   northwest of Elkridge, 1.3 mi southwest of Halethorpe, and 4.5 mi east of Columbia.
DRAINAGE AREA.--312 mi2, from automated delineation using 30-meter National Elevation Dataset, 
   digital elevation model data, dated 2006.
PERIOD OF RECORD.--October 2010 to current year.
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 8.50 ft above North American 
   Vertical Datum of 1988.
REMARKS.--Flow regulated by Liberty Reservoir, approximately 21 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. Turbidity values that are determined to be a result 
   of debris on the sensor; a function of incident sun angle; or other phenomena that do not appear to be 
   correlated to suspended-sediment concentration are removed by the hydrographer. U.S. Geological Survey
   satellite data-collection platform at station until August 14, 2018. U.S. Geological Survey water-data
   telemeter at station, August 14, 2018 to August 31, 2020. U.S. Geological Survey satellite data-collection platform
   at station August 31, 2020 to current year.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 26,900 ft³/s, May 27, 2018, gage height, 24.76 ft;
   minimum discharge, 35.0 ft³/s, Sept. 16, 17, 2012. 
COOPERATION.--Funding for the operation of this station is provided by the U.S. Fish and Wildlife Service, 
   and the U.S. Geological Survey.
This station managed by the MD-DE-DC Water Science Center Baltimore office.

Available Parameters Available Period
2010-10-09  2021-10-16
2010-10-08  2021-10-16
2018-08-14  2019-06-05
2010-10-29  2021-10-01


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Summary of all available data for this site
Instantaneous-data availability statement
*** There are no data available on the Waterdata system for the time period specified,
    although data may be available in the files of the local USGS office operating the station.