LOCATION.--Lat 42°02'48", long
74°16'38" referenced to North American Datum of 1927,
Ulster County, NY, Hydrologic Unit 02020006, at bridge on
County Highway 40, about 500 ft upstream from Esopus Creek, at
Mount Tremper.
DRAINAGE AREA.--25 mi².
PERIOD OF RECORD.--Miscellaneous measurements--1954,
2010. October 2010 to current year.
GAGE.--Water-stage recorder. Elevation of gage is 700 ft
above NAVD of 1988, from topographic map.
REMARKS.--Water Years 2014-23: Records poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge,
12,600 ft³/s, Aug. 28, 2011, gage height, 15.15 ft, but may
have been higher during period of missing data on that day;
minimum discharge undetermined.
PERIOD OF RECORD1.--November 2010 to current
year.
PERIOD OF DAILY RECORD1.--TURBIDITY: DTS12 -
November 2010 to September 2011, October 2012 to current year.
Analite - August 2022 to current year.
SUSPENDED-SEDIMENT CONCENTRATION: November 2010 to September
2011, October 2012 to current year.
SUSPENDED-SEDIMENT DISCHARGE: October 2012 to current
year.
INSTRUMENTATION1.--An optical turbidity
sensor provides readings at 15-minute intervals since November
2010.
REMARKS1.--Turbidity data are collected every
15 minutes using an in-situ turbidity probe located in a 2-inch
diameter galvanized steel pipe extending 10 ft from the left
bank. Daily suspended-sediment load and concentration are
derived from a regression equation relating turbidity to
suspended-sediment concentration.
COOPERATION1.--In cooperation with the New
York City Department of Environmental Protection.
EXTREMES FOR PERIOD OF DAILY
RECORD1.--TURBIDITY: DTS12 - Maximum, 1,980 FNU,
Feb. 25, 2016; minimum, <0.2 FNU, on many days. Analite -
Maximum, 1,380 FNU, Aug. 30, 2023; minimum, <0.2FNU, on
several days. [<, actual value is known to be less than the
value shown]
SUSPENDED-SEDIMENT CONCENTRATION: Maximum daily mean, 1,630
mg/L, Aug. 28, 2011; minimum daily mean, <1 mg/L, on many
days in 2011, 2013-14.
SUSPENDED-SEDIMENT DISCHARGE: Maximum daily, 1,270 tons, Oct.
19, 2012; minimum daily, <0.01 tons, on many days in
2013-14.
1 Water-Quality Records
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Station image
![Graph of Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU), [Observator, Analite NEP 5000 S]](https://natwebcaww02.wr.usgs.gov/nwisweb/data/img/USGS.01362487.333432.63680..20241114.20241121..0..gif)
