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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.
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USGS Water-Year Summary 2024
01613000 POTOMAC RIVER AT HANCOCK, MD
LOCATION - Lat 39°41'51.2", long 78°10'40.4" referenced to North American Datum of 1983, Washington County, MD, Hydrologic Unit 02070004, on left bank, 0.2 mi downstream from Little Tonoloway Creek, 0.5 mi downstream from bridge on U.S. Highway 522 at Hancock, 1.1 mi upstream from Tonoloway Creek (formerly called Great or Big Tonoloway Creek), and at mile 239.
DRAINAGE AREA - 4,064 mi².
REVISIONS HISTORY - WSP 781: 1933(M). WDR WV-97-1: Drainage area. OFR 95-292 (Second edition, 2006): Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1932 to current year. Gage-height records collected at same site since June 1925 are contained in reports of National Weather Service.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 383.00 ft above North American Vertical Datum of 1988. Oct. 1, 1932, to Jan. 5, 1935, Mar. 18, 1936, to Jan. 20, 1937, nonrecording gage, on former highway bridge just upstream at same gage datum.
REMARKS - Water Years 2022-2023: Records good, except those for estimated discharges, which are poor.
Water Years 2020-2021: Records good. No estimated discharges.
Water Years 2017-2019: Records good, except those for estimated discharges, which are poor.
Water Years 2014-2016: Records good, except those for estimated daily discharges, which are poor.
Water Year 2013 and prior years' accuracy statements can be found in Annual Water Data Reports.
Slight regulation at low flow from power plants upstream. Low flow affected slightly by Stony River Reservoir prior to July 1981, since December 1950 by Savage River Reservoir (see station 01597500), and since July 1981 by Jennings Randolph Lake. National Weather Service gage-height telemeter at station. U.S. Army Corps of Engineers satellite data-collection platform at station.
Slight regulation at low flow from power plants upstream. Low flow affected slightly by Stony River Reservoir prior to July 1981, since December 1950 by Savage River Reservoir (see station 01597500), and since July 1981 by Jennings Randolph Lake. National Weather Service gage-height telemeter at station. U.S. Army Corps of Engineers satellite data-collection platform at station.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage known prior to 1932, about 40 ft in May 1889, discharge, about 220,000 ft³/s.
