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ICE EFFECTS ON STREAMFLOW -- During cold weather, ice effects on stage and discharge determinations at some streamgages are likely. Streamgages experiencing ice conditions will have the discharge record temporarily disabled to prevent the display of erroneous discharge values. The discharge record will resume when it is determined that ice conditions are no longer present. Adjustment of data for ice effects can only be done after detailed analysis.
LOCATION.--Lat 39°40'10.6", long 78°47'16.9", Allegany County, MD, Hydrologic Unit 02070002, on right bank at downstream side of railway bridge, 0.15 mi downstream from Braddock Run, 2.0 mi upstream from Cumberland, and mouth. DRAINAGE AREA.--247 mi2. PERIOD OF RECORD.--May 1905 to July 1906 (published as "at Cumberland"), October 1929 to current year. REVISIONS HISTORY.--WSP 726: Drainage area. WSP 1432: 1906, 1930(M), 1933-34(M), 1936-37, 1945(M). GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 640.27 ft above North American Vertical Datum of 1988. May 6, 1905, to July 14, 1906, nonrecording gage at highway bridge 700 ft upstream at different datum. Oct. 18, 1929, to Mar. 17, 1936, water-stage recorder, and Apr. 1, 1936, to Mar. 19, 1937, nonrecording gage at site 200 ft upstream at present gage datum. REMARKS.--Records include drainage from numerous active and abandoned coal mines. Groundwater flow is diverted into the basin from the Georges Creek basin by Hoffman Drainage Tunnel (see station 01601420, continuous record, July 2015 to present). Miscellaneous measurements of discharge from the Hoffman Drainage Tunnel have been made in water years 1944, 1964-65, 1967-82, and 1984 by the U.S. Geological Survey, and in water years 1958 and 1959 by the Maryland Geological Survey. Slight diurnal fluctuation at low flow caused by quarry upstream. U.S. Army Corps of Engineers satellite data-collection platform at station. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 45,900 ft3/s, Jan. 19, 1996, gage height, 23.11 ft; minimum discharge, 9.0 ft3/s, Oct. 14, 1930. COOPERATION.--Funding for the operation of this station is provided by the U.S. Army Corps of Engineers, and the U.S. Geological Survey.
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