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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2024
01484080 MURDERKILL RIVER AT FREDERICA, DE
LOCATION - Lat 39°00'37.8", long 75°27'29.9" referenced to North American Datum of 1983, Kent County, DE, Hydrologic Unit 02040207, on right bank, 300 ft downstream of Route 1 bridge, 0.2 mi downstream of confluence with Spring Creek, 0.5 mi east of Frederica, and 7.4 mi upstream from mouth.
DRAINAGE AREA - 82.8 mi².
REVISIONS HISTORY - WDR-US-2013: 2011-2012 (DO).
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 1997 to September 1999 (stage only); September 17-30, 2002 (located at upstream side of State Route 1 highway bridge, stage only); June 2007 to December 2008; June 2010 to current year.
GAGE - Water-stage recorder and velocity meter. Datum of gage is 0.00 ft above North American Vertical Datum of 1988. Prior to October 1, 2016, datum of gage was 0.00 ft above National Geodetic Vertical Datum of 1929.
REMARKS - Water Years 2020-2021: Gage-height record good and discharge record fair, except for estimated discharges, which are poor. Missing data due to equipment malfunction.
Water Year 2019: Gage-height record good and discharge record fair. Missing data due to equipment malfunction.
Water Year 2018: Gage-height record good and discharge record fair, except for estimated discharges, which are poor. Missing data due to equipment malfunction.
Water Year 2017: Gage-height record good and discharge record fair. Missing data due to equipment malfunction.
Water Years 2014-2016: Gage-height record good and discharge record fair. Missing data due to equipment malfunction.
Water Year 2013 and prior years’ accuracy statements can be found in Annual Water Data Reports.
This is a tidal discharge station. Discharge is computed from relations between stage vs. area and index velocity vs. mean channel velocity. Daily mean discharges were computed using the Godin low-pass filter to remove tidal effects from unit values. U.S. Geological Survey satellite data-collection platform at station.
This is a tidal discharge station. Discharge is computed from relations between stage vs. area and index velocity vs. mean channel velocity. Daily mean discharges were computed using the Godin low-pass filter to remove tidal effects from unit values. U.S. Geological Survey satellite data-collection platform at station.
EXTREMES FOR PERIOD OF RECORD - Maximum recorded elevation, 5.17 ft, August 28, 2011; minimum recorded elevation, -4.33 ft, November 22, 2016. Maximum discharge, 4,800 ft³/s, August 28, 2011; minimum discharge -5,770 ft³/s, May 12, 2008.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: June 2007 to December 2008, June 2010 to current year.
WATER TEMPERATURE: June 2007 to December 2008, June 2010 to current year.
pH: June 2007 to December 2008, July 2010 to current year.
DISSOLVED OXYGEN: June 2007 to December 2008, June 2010 to current year.
COOPERATION - Funding for water-quality data collection is provided by the Delaware Department of Natural Resources and Environmental Protection, and the United States Geological Survey.
INSTRUMENTATION - Multi-parameter water-quality monitor, June 2007 to December 2008, June 2010 to current year.
REMARKS - Occasional missing record due to periodic instrument malfunction.
EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: Maximum, 32.7 °C, July 21, 2019; minimum, -1.2 °C, Jan. 23, 2016.
SPECIFIC CONDUCTANCE: Maximum, 44,800 microsiemens/cm, August 21, 2016; minimum, 96 microsiemens/cm, Sept. 5, 2020.
pH: Maximum, 9.1 standard units, April 30 2022; minimum, 6.1 standard units, multiple occurrences recorded, first occurrence recorded on May 21, 2018.
DISSOLVED OXYGEN: Maximum, 15.7 mg/L, multiple occurrences recorded, first occurrence record on April 23, 2018; minimum, 0.6 mg/L, August 4, 2011.
SPECIFIC CONDUCTANCE: Maximum, 44,800 microsiemens/cm, August 21, 2016; minimum, 96 microsiemens/cm, Sept. 5, 2020.
pH: Maximum, 9.1 standard units, April 30 2022; minimum, 6.1 standard units, multiple occurrences recorded, first occurrence recorded on May 21, 2018.
DISSOLVED OXYGEN: Maximum, 15.7 mg/L, multiple occurrences recorded, first occurrence record on April 23, 2018; minimum, 0.6 mg/L, August 4, 2011.
