USGS Water-Year Summary for Site 01425000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

01425000 WEST BRANCH DELAWARE RIVER AT STILESVILLE, NY

LOCATION - Lat 42°04'29.7", long 75°23'44.9" referenced to North American Datum of 1983, Delaware County, NY, Hydrologic Unit 02040101, on right bank at Stilesville, 0.5 mi upstream from Cold Spring Creek, 1.4 mi downstream from Cannonsville Dam, and 2.0 mi northeast of Deposit.

DRAINAGE AREA - 456 mi².

REVISIONS HISTORY - WDR NY-05-1: 1973, 1977, 1979, 1986, 1993, 2004. 2014: Daily temperature. Water temperature records for the period Mar. 13, 2020, to Feb. 17, 2021, were revised on May 2, 2022, due to adjustment of a correction.

SURFACE-WATER RECORDS

PERIOD OF RECORD - July 1952 to current year.

GAGE - Water-stage recorder, crest-stage gage, and concrete control. Datum of gage is 992.23 ft above NGVD of 1929 (levels by Board of Water Supply, City of New York) and 991.68 ft above NAVD of 1988. Prior to Oct. 1, 1964, at site 600 ft downstream at datum 1.37 ft higher.

REMARKS - Subsequent to October 1963, entire flow from 454 mi² of drainage area controlled by Cannonsville Reservoir (station 01424997). Part of flow diverted for New York City municipal supply. Remainder of flow (except for conservation releases and spill) impounded for release during period of low flow in the lower Delaware River basin, as directed by the Delaware River Master.
Water Years 2014-23: Records fair.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, since construction of Cannonsville Reservoir in 1963, 33,100 ft³/s, June 28, 2006, gage height, 17.72 ft; minimum discharge not determined.

EXTREMES FOR PERIOD PRIOR TO REGULATION - Maximum discharge, prior to construction of Cannonsville Reservoir in 1963, 17,500 ft³/s, Jan. 22, 1959, gage height, 9.01 ft, site and datum then in use.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 1962 to current year.

INSTRUMENTATION - Water-temperature satellite telemeter provides 15-minute-interval readings. From October 1975 to February 1993, water-temperature recorder provided one-hour-interval readings. Prior to October 1975, water-temperature recorder provided continuous recordings.

REMARKS - Temperature readings prior to Oct. 1, 2007, rounded to the nearest 0.5 °C. Water temperature is affected by release of water from upstream reservoir.

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Prior to Oct. 1, 2007--Maximum (water years 1963-78, 1980-82, 1984-86, 1988, 1990-92, 1994-95, 1997, 1999-2002, 2004-07), 30.5 °C, July 2, 1963; minimum (water years 1963-95, 1998-2003, 2006), 0.0 °C on many days during winter periods, except 1969, 1973, 1986-87, 1990-91, 1994-95, 2001, 2006. WATER TEMPERATURE: After Oct. 1, 2007--Maximum, 24.6 °C, Aug. 20, 2018; minimum, 0.0 °C, Feb. 20, 2015.