PROVISIONAL DATA SUBJECT TO REVISION

LOCATION.--Lat 39°46'10.2", long 75°34'36.1", New Castle County, Hydrologic Unit 02040205,
   on left bank at upstream side of Rising Sun Bridge, in Wilmington, and 4.2 mi upstream from mouth.
DRAINAGE AREA.--314 mi2.
PERIOD OF RECORD.--October 1946 to current year.  Prior to December 1946 monthly discharge only,
   published in WSP 1302.
REVISED RECORDS.--WSP 1432:  1948, 1950; WDR-US-2011: 2007-2010.
GAGE.--Water-stage recorder and concrete control.  Datum of gage is 68.23 ft above National Geodetic
   Vertical Datum of 1929.
REMARKS.--Some diurnal fluctuation at low flow caused by mills upstream from station. Flow regulated since
   November 1973 by Marsh Creek Reservoir (see station 01480684 Marsh Creek Lake nr. Downington, PA), capacity 
   7,230,000,000 gal, about 27 mi upstream. No diversion just upstream from station by plant of E. I. du Pont de Nemours & Co.
   since June l3, 1960. Gage relocated to left bank at upstream side of Rising Sun Bridge, October 2006 at same gage datum. 
   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, 29,000 ft3/s, June 23, 1972, maximum gage height 15.49 ft, June 23, 1972
   (at old gage location downstream of mill dam, prior to regulation). Maximum gage height, 18.71 ft, August 28, 2011 (at current gage location);
   minimum discharge, 30 ft3/s,  Dec. 26, 1948.
COOPERATION.--Funding for the operation of this station is provided by the Delaware Geological Survey, the 
   City of Wilmington, and the  U.S. Geological Survey.
CRITICAL LEVELS.--Bankfull stage; 15.2 ft (5,375 ft3/s), flood stage; 16.5 ft (8,940 ft3/s), 
   information provided by the National Weather Service.