Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

* We've detected you're using a mobile device. Find our Next Generation Station Page here.
Click to hideNews Bulletins
Click to hide state-specific text

! We're replacing this page with a Next Generation Monitoring Location Page.
We're modernizing Water Data for the Nation delivery. Find out what this means for you. This page will be discontinued July 2023.



Click to hidestation-specific text
LOCATION.--Lat 39°41'51.2", long 78°10'40.4", 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.
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.
REVISIONS HISTORY.--WSP 781: 1933(M). WDR WV-97-1: Drainage area. OFR 95-292 (Second edition, 2006): Drainage
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.--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 FOR PERIOD OF RECORD.--Maximum discharge, 340,000 ft3/s, Mar. 18, 1936,
   gage height, 47.60 ft; minimum discharge, 180 ft3/s, Oct. 4, 1932.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage known prior to 1932, about 40 ft in May 1889,
   discharge, about 220,000 ft3/s.
COOPERATION.--Funding for the operation of this station is provided by PE Hydro Generation, LLC, 
   and the U.S. Geological Survey. 
This station managed by the MD-DE-DC Water Science Center Frostburg office.

Available Parameters Available Period
1990-10-01  2022-09-27
2007-10-01  2022-09-27


  -- or --



Summary of all available data for this site
Instantaneous-data availability statement

Discharge, cubic feet per second

Most recent instantaneous value: 688 09-27-2022   22:15 EDT
Graph of  Discharge, cubic feet per second

Add up to 2 more sites and replot for "Discharge, cubic feet per second"


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages

Daily discharge, cubic feet per second -- statistics for Sep 27 based on 89 water years of record more
Median Most Recent
Value Sep 27
Mean Max
254 512 646 688 1030 1750 33100

Gage height, feet

Most recent instantaneous value: 2.91 09-27-2022   22:15 EDT
Graph of  Gage height, feet

Add up to 2 more sites and replot for "Gage height, feet"


Create presentation-quality / stand-alone graph.   Subscribe to WaterAlert      

See this graph on the Monitoring Location Pages