USGS Water-Year Summary for Site 01481500

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Min.,Max.,Mean)
	63680 Turbidity, Form Neph(Max.,Mean,Min.) [Discontinued, TS087]

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

01481500 BRANDYWINE CREEK AT WILMINGTON, DE

LOCATION - Lat 39°46'10.2", long 75°34'36.1" referenced to North American Datum of 1983, New Castle County, DE, 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.

REVISIONS HISTORY - WSP 1432: 1948, 1950; WDR-US-2011: 2007-2010.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1946 to current year. Prior to December 1946, monthly discharge only, published in WSP 1302.

GAGE - Water-stage recorder, crest stage gage, and concrete control. Datum of gage is 67.17 ft above North American Vertical Datum of 1988.

REMARKS -

Water Year 2023: Records good, except those above 26,000 ft³/s and those for estimated discharges, which are poor.

Water Year 2022: Records good, except those above 26,000 ft³/s, which are poor.

Water Year 2021: Records good, except those above 26,000 ft³/s and those for estimated discharges, which are poor.

Water Years 2017-2020: Records good, except those for estimated discharges, which are poor.

Water Years 2014-2016: Records good, except those for estimated daily discharges, which are poor.

Water year 2013 and prior years' accuracy statements can be found in Annual Water Data Reports.

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 near Downington, PA), capacity 7,230,000,000 gal, about 27 mi upstream. For unregulated statistics of monthly mean data and summary statistics for water years 1947 to 1973, reference WDR MD-DE-DC-05-1. No diversion just upstream from station by plant of E. I. du Pont de Nemours & Co. since June 13, 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.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 33,700 ft³/s, Sept. 2, 2021, gage height, 23.13 ft., September 2, 2021; minimum discharge, 30 ft³/s, Dec. 26, 1948.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 2006 to current year. WATER TEMPERATURE: October 2006 to current year. pH: October 2006 to current year. TURBIDITY: October 2006 to current year. DISSOLVED OXYGEN: October 2006 to current year.

COOPERATION - Funding for water-quality data collection is provided by the Delaware Department of Natural Resources and Environmental Protection, The City of Wilmington, and the United States Geological Survey.

INSTRUMENTATION - Multi-parameter water-quality monitor, October 2006 to current year.

REMARKS -

Missing data due to equipment malfunction.

Turbidity values greater than 1,000 formazin nepthelometric units (FNU) exceed the instrument calibration range. Values are included in the record but are presumed to have lower precision.

EXTREMES FOR PERIOD OF DAILY RECORD -

TEMPERATURE: Minimum: -0.1 degrees Celsius, Multiple days throughout period of record, Maximum: 31.6 degrees Celsius, July 23, 2011.

SPECIFIC CONDUCTANCE: Minimum: 55 microsiemens per centimeter, November 30, 2020; Maximum 1,820 microsiemens per centimeter, March 4, 2015.

pH: Minimum: 6.6 standard units, October 1,2010; Maximum 10.0 standard units, July 07, 2010.

DISSOLVED OXYGEN: Minimum 5.5 milligrams per liter, April 15 and 16, 2014; Maximum 16.4 milligrams per liter, March 04, 2009.

TURBIDITY:

Active Sensor (November 16, 2017 - present): Minimum 0.0 formazin nephelometric units, multiple days throughout period of record; Maximum 383 formazin nephelometric units, May 17, 2018.

Active Sensor (September 29, 2006 - November 16, 2017): Minimum 0.0 formazin nephelometric units, multiple days throughout period of record; Maximum 602 formazin nephelometric units, July 12, 2010.