USGS Water-Year Summary 2021
01480870 EAST BRANCH BRANDYWINE CREEK BELOW DOWNINGTOWN, PA
LOCATION - Lat 39°58'07", long 75°40'25" referenced to North American Datum of 1927, Chester County, PA, Hydrologic Unit 02040205, on left bank at downstream side of Sugars Bridge (U.S. Highway 322), 2,000 ft upstream from Valley Creek, 1.5 mi north of Marshallton, and 3.3 mi southeast of Downingtown.
DRAINAGE AREA - 89.9 mi².
- WDR PA-75-1: 1972(P), 1973, 1974.
PERIOD OF RECORD - February 1972 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 195 ft above National Geodetic Vertical Datum of 1929, from topographic map. Feb 1 to Apr 10, and Jun 25 to Nov 17, 1972, nonrecording gage at same site and datum. Satellite and landline telemetry at station.
COOPERATION - Station established and maintained by the U.S. Geological Survey. Funding for the operation of this station is provided by the Chester County Water Resources Authority and the U.S. Geological Survey.
PERIOD OF RECORD - October 2005 to current year.
INSTRUMENTATION - Precipitation gage interfaced with data collection platform.
PERIOD OF RECORD - October 1998 to current year.
PERIOD OF RECORD - October 1965 to September 1966, October 1970 to current year.
PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: February 1972 to current year.
pH: February 1972 to current year.
WATER TEMPERATURE: February 1972 to current year.
DISSOLVED OXYGEN: February 1972 to current year.
TURBIDITY: October 2005 to current year.
SUSPENDED- SEDIMENT DISCHARGE: October 2007 to current year.
COOPERATION - Station established and maintained by the U.S. Geological Survey in cooperation with the Chester County Water Resources Authority.
INSTRUMENTATION - Water-quality monitor since February 1972.
EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 891 microsiemens per centimeter, Mar 5, 2001; minimum, 66 microsiemens per centimeter, Aug 28, 2011.
pH: Maximum, 9.9, May 13, Jun 5, 1973; minimum, 5.4, Oct 24, 26, 1973.
WATER TEMPERATURE: Maximum, 33.0°C, Jul 18, 1977; minimum, -0.1°C, many days during winters.
DISSOLVED OXYGEN: Maximum, 19.4 mg/L, Mar 18, 1989; minimum, 0.8 mg/L, Jul 23, 1984.
TURBIDITY: Maximum, 1,080 FNU, Jul 23, 2013; minimum, 0.0 FNU, many days.