Click
to
hide
Water-Year
Summary
instructions
and
information
- 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.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
01483177 APPOQUINIMINK RIVER NEAR ODESSA, DE
LOCATION - Lat 39°27'57.4", long 75°36'48.7" referenced to North American Datum of 1983, New Castle County, DE, Hydrologic Unit 02040205, on downstream side of bridge on Silver Run Road (Rt. 9) near Odessa, about 3 mi upstream from the confluence with the Delaware River.
SURFACE-WATER RECORDS
GAGE - Water-quality monitor since Oct. 26, 2011, provides continuous readings (15-minute log interval). Sensor is mounted near left bank, at the upstream wingwall of Route 9 bridge.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD -
TEMPERATURE: October 2011 to current year
SPECIFIC CONDUCTANCE: October 2011 to current year
pH: October 2011 to current year
DISSOLVED OXYGEN: October 2011 to current year
COOPERATION - Funding for water-quality data collection is provided by the Delaware Department of Natural Resources and Environmental Protection through the Delaware Geological Survey, and the U.S. Geological Survey.
INSTRUMENTATION - Multi-parameter water-quality monitor, October 26, 2011 to current year.
REMARKS - Missing record due to periodic instrument malfunction, blow-out tides caused by heavy NW / WNW wind, and probes affected by ice.
EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 20,900 microsiemens/cm on Sept. 8, 2022; minimum, 279 microsiemens/cm, Jan. 09, 2019.
WATER TEMPERATURE: Maximum, 32.1°C, first occurrence on July 21, 2019; minimum, -0.4°C, Feb. 24, 2015, Jan. 30, 2022.
pH: Maximum, 9.0 standard units, Apr. 6-9, 14, 2012; minimum, 6.7 standard units, Sept. 4-6, 2012.
DISSOLVED OXYGEN: Maximum, 16.3 mg/L, Feb. 28, 2017; minimum, 1.2 mg/L, July 10, 2012.
WATER TEMPERATURE: Maximum, 32.1°C, first occurrence on July 21, 2019; minimum, -0.4°C, Feb. 24, 2015, Jan. 30, 2022.
pH: Maximum, 9.0 standard units, Apr. 6-9, 14, 2012; minimum, 6.7 standard units, Sept. 4-6, 2012.
DISSOLVED OXYGEN: Maximum, 16.3 mg/L, Feb. 28, 2017; minimum, 1.2 mg/L, July 10, 2012.
