LOCATION.--Lat 43°01'11.1", long 75°01'42.5" referenced to North American Datum of 1983, Herkimer County, NY, Hydrologic Unit 02020004, on right bank 700 ft downstream of bridge on Central Avenue, 0.8 mi downstream of Steele Creek, and 0.9 mi upstream of Fulmer Creek at the Village of Ilion Marina.
DRAINAGE AREA.--666 mi².  
PERIOD OF DAILY RECORD¹.--WATER TEMPERATURE: May 2019 to current year (navigation seasons only).
SPECIFIC CONDUCTANCE: May 2019 to current year (navigation seasons only).
pH: May 2019 to current year (navigation seasons only).
DISSOLVED OXYGEN: May 2019 to current year (navigation seasons only).
TURBIDITY: May 2019 to current year (navigation seasons only).
INSTRUMENTATION¹.--A multi-parameter water-quality sonde measures water temperature, specific conductance, pH, dissolved oxygen, and turbidity at 15-minute intervals since May 2019.
COOPERATION¹.--Maintained by the Hudson River Environmental Conditions Observing System in cooperation with the New York State Department of Environmental Conservation.

EXTREMES FOR PERIOD OF DAILY RECORD¹.--WATER TEMPERATURE: Maximum, 28.1 °C, Aug. 8, 2022; minimum, 5.4 °C, Nov. 9, 2019.
SPECIFIC CONDUCTANCE: Maximum, 735 uS/cm @ 25 °C, Sept. 11, 202; minimum, 195 uS/cm @ 25 °C, Nov. 11, 2019.
pH: Maximum, 8.7, July 17, 18, 2022; minimum, 7.1, Nov. 10, 2019.
DISSOLVED OXYGEN: Maximum, 14.2 mg/L, May 30, 2023; minimum, 4.5 mg/L, Sept. 1, 2022.
TURBIDITY: Maximum, 1,237 FNU, Aug. 8, 2023; minimum, <0.3 FNU, May 26, 27, 31, June 1, 5, 2019. [<, actual value is known to be less than the value shown]
¹ Water-Quality Records

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