PROVISIONAL DATA SUBJECT TO REVISION

STATION.--01592500  PATUXENT RIVER NEAR LAUREL, MD
LOCATION.--Lat 39°06;'56.6", long 76°52;'25.5", Prince Georges County, Hydrologic Unit 02060006,
   on right bank at Rocky Gorge pumping station, 600 ft downstream from T. Howard Duckett Reservoir,
   0.7 mi upstream from Walker Branch, 1.3 mi north west of Laurel, and 81 mi upstream from mouth.
DRAINAGE AREA.--132 mi2.
PERIOD OF RECORD.--October 1944 to current year.
REVISED RECORDS.--WDR MD-DE-78-1: 1976(M). WDR MD-DE-89-1: 1978(M), 1979(M).
GAGE.--Water-stage recorder. Datum of gage is 153.5 ft above National Geodetic Vertical Datum of 1929
   (levels by Washington Suburban Sanitary Commission). Prior to Oct. 1, 1955, water-stage recorder and concrete
   control at site 0.3 mi downstream at different datum. Oct. 1, 1955 to Sept. 30, 1956, nonrecording gage at
   present site at datum 1.2 ft lower. Oct. 1, 1956 to Jan. 27, 1957, nonrecording gage at present site
   and datum. Jan. 28, 1957 to May 3, 1972,  water-stage recorder and concrete control at present site and datum.
   May 4, 1972 to Sept. 4, 1973, nonrecording gage at present site and datum.
REMARKS.--Records do not include diversion at Patuxent (formerly Willis School) filtration plant for
   supply of Washington Suburban Sanitary District. Flow regulated by Triadelphia Reservoir, and since
   March 1954 by T. Howard Duckett Reservoir, combined usable capacity, 11,800,000,000 gal; dead storage,
   80,000,000 gal. U.S. Geological Survey gage-height telemeter at station. Several measurements of water
   temperature were made during the year.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 26,000 ft3/s, Jun. 22, 1972,
   gage height, 25.00 ft; minimum discharge, 0.05 ft3/s, Jul. 18, 1985 (valve closed for repair).
COOPERATION.--Funding for the operation of this station is provided by the Washington Suburban Sanitary
   Commission, and the U.S. Geological Survey.