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During cold weather, ice effects on stage, groundwater levels, precipitation and water quality parameters at some stream-gaging stations and wells are likely. Data values reported on these pages may be significantly higher or lower than actual values. Adjustment of data for ice effects can only be done after detailed analysis. Users are encouraged to contact this office for more information on specific stream-gaging stations or wells.
LOCATION.--Lat 39°07'41.1", long 77°20'08.8", Montgomery County, Hydrologic Unit 02070008, on right bank 60 ft downstream from bridge on State Highway 28, 150 ft downstream from mouth of Great Seneca Creek, 0.5 mi east of Dawsonville, and 5.8 mi upstream from mouth. DRAINAGE AREA.--101 mi2. PERIOD OF RECORD.--September 1930 to current year. GAGE.--Water-stage recorder and crest-stage gage. Concrete control since March 3, 1934. Datum of gage is 213.31 ft above North American Vertical Datum of 1988. Sept. 26 to Nov. 9, 1930, chain gage, and Nov. 10, 1930 to Apr. 6, 1934, water-stage recorder, at highway bridge 60 ft upstream at same gage datum. REMARKS.--Small diversion at times for irrigation upstream from station. U.S. Geological Survey satellite data-collection platform at station. Water-quality records for some prior periods have been collected at this location. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 26,100 ft3/s, June 22, 1972, gage height, 16.40 ft; minimum discharge, 1.7 ft3/s, Sept. 28, 29, 1930. COOPERATION.--Funding for the operation of this station is provided by the Interstate Commission on the Potomac River Basin, and the U.S. Geological Survey.
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