LOCATION.--Lat 40°43'17.5", long
74°00'56.2" referenced to North American Datum of
1983, New York County, NY, Hydrologic Unit 02030101, on left
bank at Pier 25, 1.3 mi upstream of mouth, 9.8 mi downstream of
George Washington Bridge on US Highway 95, and 12.1 mi
downstream of Harlem River in New York, New York.
PERIOD OF DAILY RECORD1.--WATER TEMPERATURE:
July 2019 to current year.
SPECIFIC CONDUCTANCE: July 2019 to current year.
SALINITY: July 2019 to current year.
pH: July 2019 to current year.
DISSOLVED OXYGEN: July 2019 to current year.
TURBIDITY: July 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 July 2019. Salinity record computed from
specific-conductance readings.
COOPERATION1.--Maintained by the Hudson River
Environmental Conditions Observing System in cooperation with
the Hudson River Park Trust.
EXTREMES FOR PERIOD OF DAILY RECORD1.--WATER
TEMPERATURE: Maximum, 26.7 °C, July 17, 2023; minimum, 0.5 °C,
Feb. 21, 2021.
SPECIFIC CONDUCTANCE: Maximum, 44,700 uS/cm @ 25 °C, Aug. 11,
2022; minimum, 1,895 uS/cm @ 25 °C, Dec. 20, 2023.
SALINITY: Maximum, 28.9 psu, Aug. 11, 2022; minimum, 1.0 psu,
Dec. 20, 2023.
pH: Maximum, 8.3, Nov. 8, 16, 2019; minimum, 7.4, Aug. 2, 4, 5,
6, 2019.
DISSOLVED OXYGEN: Maximum, 13.4 mg/L, Dec. 19, 2019, Feb. 8,
2022; minimum, 3.5 mg/L, Aug. 31, 2022.
TURBIDITY: Maximum, 61.5 FNU, Feb. 5, 2021; minimum, <0.3
FNU, Feb. 28, 2021. [<, actual value is known to be less
than the value shown]
1 Water-Quality Records
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