USGS Water-Year Summary for Site 01579550

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Mean,Min.)
	00400 pH(Max.,Med.,Min.)
	63680 Turbidity, Form Neph(Max.)
	63680 Turbidity, Form Neph(Mean,Min.) [(2)]
	99133 NO3+NO2,water,insitu(Max.,Min.,Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

01579550 SUSQUEHANNA RIVER NEAR DARLINGTON, MD

LOCATION - Lat 39°37'33.8", long 76°09'27.9" referenced to North American Datum of 1983, Harford County, MD, Hydrologic Unit 02050306,

DRAINAGE AREA - 27,300 mi². from automated delineation using 30-meter National Elevation Dataset digital elevation model data dated 2011.

SURFACE-WATER RECORDS

GAGE - Electronic data logger and water-quality monitor. Datum of gage is 9 ft above North American Vertical Datum of 1988.

COOPERATION - Funding for continuous water-quality data collection is provided by the U.S. Geological Survey.

WATER-QUALITY RECORDS

PERIOD OF RECORD - WATER TEMPERATURE: Feb 2014 to current year. SPECIFIC CONDUCTANCE: Feb 2014 to current year. DISSOLVED OXYGEN: Feb 2014 to Sept 30, 2015. Parameter added back on 6/6/23 . pH: Feb 2014 to Sept 30, 2015. Parameter added back on 6/6/23. TURBIDITY: Feb 2014 to current year. NITRATE: Aug. 2014 to current year.

INSTRUMENTATION - Deployed multi-parameter monitor meter was equipped with integrated temperature and specific conductance sensor, pH sensor, turbidity, dissolved oxygen optical sensors. Also deployed, is a Nitrate monitor meter with internal temperature sensor. Monitor meters are connected to an electronic data logger (EDL). Data was collected on fixed 15 minute intervals (0 and 15 minute marks) and transmitted every 1 hour via modem.

REMARKS - For Water Year 2015. 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. Missing record due to periodic instrument malfunction.

EXTREMES FOR PERIOD OF DAILY RECORD -

WATER TEMPERATURE: Maximum, 35.7°C, July 30, 2020; minimum, -1.0°C, on Feb 14, 2014.

SPECIFIC CONDUCTANCE: Maximum, 437 microsiemens per centimeter, November 5, 2020; minimum, 114 microsiemens per centimeter, multiple occurrences, first occurrence on August 15, 2018.

600 series meter pH: Maximum, 12.6 standard units, May 20, 2013; minimum, 6.6 standard units, Sept. 4, 2014.

EXO pH: Maximum, 8.8 standard units, September 11, 2023; minimum, 7.2 standard units, July 15, 2023.

600 series meter DISSOLVED OXYGEN: Maximum, 18.6 milligrams per liter, March 3, 2014; minimum, 5.7 milligrams per liter, July 28, 2014.

EXO DO: Maximum, 11.3 milligrams per liter, September 11, 2023; minimum, 4.7 milligrams per liter, July 15, 2023.

EXO TURBIDITY: Maximum, 364 formazin nephelometric units (FNU), December 26, 2020 ; minimum, 0.0 formazin nephelometric units (FNU) Oct. 2, 2015.

NITRATE: Maximum, 2.23 milligrams per liter on December 26, 2020; minimum, 0.38 milligrams per liter, on many days. First occurrence was September 15, 2016.

NITRATE (Temporary Right Bank Location): Maximum, 1.26 milligrams per liter, on many days. First occurrence was November 22, 2019; minimum, 0.86 milligrams per liter, on many days. First occurrence was October 30, 2019.