LOCATION.--Lat 42°29'58.6", long
73°46'36.5" referenced to North American Datum of
1983, Rensselaer County, NY, Hydrologic Unit 02020006, on left
bank at Schodack Island State Park, 0.7 mi downstream of
Castleton Bridge on State Highway 912M, 1.4 mi northeast of
Schodack Landing, New York, and 1.8 mi upstream of Coeymans
Creek.
DRAINAGE AREA.--8,594 mi².
PERIOD OF RECORD1.--April 2019 to current
year.
PERIOD OF DAILY RECORD1.--WATER TEMPERATURE:
April 2019 to current year.
SPECIFIC CONDUCTANCE: April 2019 to current year.
pH: April 2019 to current year.
DISSOLVED OXYGEN: April 2019 to current year.
TURBIDITY: May 2019 to current year.
INSTRUMENTATION1.--A multi-parameter
water-quality sonde measures water temperature, specific
conductance, pH, dissolved oxygen, and turbidity at 15-minute
intervals since April 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, 28.8°C, Aug. 7, 8, 2022; minimum, -0.6°C,
on several days in winter 2021.
SPECIFIC CONDUCTANCE: Maximum, 482 uS/cm @ 25°C, Mar. 5, 2021;
minimum, 127 uS/cm @ 25°C, Apr. 23, 2019.
pH: Maximum, 9.0, July 27, 2020; minimum, 7.4, on many
days.
DISSOLVED OXYGEN: Maximum, 15.4 mg/L, Dec. 26, 27, 28, 2022,
Feb. 6, 12, 2023; minimum, 4.5 mg/L, July 4, 2020.
TURBIDITY: May 19, 2019 to July 28, 2022: Maximum, 640 FNU,
Nov. 2, 2019; minimum, <0.3 FNU, on many days. [<, actual
value is known to be less than the value shown] Aug. 2, 2022 to
current year: Maximum, 390 FNU, July 11, 2023; minimum,
1.0 FNU, Aug. 5, 2022, June, 2, 2023.
1 Water-Quality Records