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Water-Year Summary for Site 01578310

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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.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2023
LOCATION - Lat 39°39'28.4", long 76°10'28.0" referenced to North American Datum of 1983, Harford County, MD, Hydrologic Unit 02050306, 1.0 mi southwest of Conowingo, and 9.9 mi upstream from mouth.
DRAINAGE AREA - 27,100 mi².

https://waterdata.usgs.gov/monitoring-location/01578310/#parameterCode=00060&startDT=2021-09-02&endDT=2022-11-07: 2021-2023.

PERIOD OF RECORD - October 1967 to current year.
GAGE - Water-stage recorder. Datum of gage is 4.16 ft above North American Vertical Datum of 1988.
  • Water Year 2022: Records poor.
  • Water Years 2019-2021: Records fair, except those for estimated discharges, which are poor.
  • Water Year 2018: Records fair, except those for estimated discharges, which are poor.
  • Water Year 2017: Records fair, no estimated discharges.
  • Water Years 2014-2016: Records fair, no estimated daily discharges.
  • Water Year 2013 and prior years' accuracy statements can be found in Annual Water Data Reports.

  • Flow regulated by Conowingo Reservoir beginning October 1928, usable capacity, 55,070,000,000 gal; dead storage, 45,290,000,000 gal. Records do not include a small infrequent diversion upstream from station to augment municipal supply of city of Baltimore. Records of diversion available from Baltimore City Department of Public Works. U.S. Geological Survey satellite data-collection platform at station.