LOCATION.--Lat 42°00'10.9", long
75°23'00.7" referenced to North American Datum of
1983, Delaware County, NY, Hydrologic Unit 02040101, on left
bank at downstream side of bridge on County Highway 56 in Hale
Eddy, and 9 mi upstream from confluence of East and West
Branches near Hancock.
DRAINAGE AREA.--595 mi².
PERIOD OF RECORD.--November 1912 to current year.
REVISIONS HISTORY.--WSP 871: 1916. WDR NY-82-1: Drainage
area.
GAGE.--Water-stage recorder. Datum of gage is 946.46 ft
above NGVD of 1929 and 945.98 ft above NAVD of 1988. Prior to
Sept. 8, 1928, nonrecording gage at same site and datum.
REMARKS.--Subsequent to October 1963, entire flow from
454 mi² 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 periods of low
flow in the lower Delaware River basin, as directed by the
Delaware River Master.
Water Years 2014-19: Records good except those for estimated
daily discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, since
construction of Cannonsville Reservoir in 1963, 43,400 ft³/s,
June 28, 2006, gage height, 19.10 ft; minimum discharge, 17
ft³/s, Oct. 20, 1963; minimum gage height, 1.03 ft, Aug. 4,
1936.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Oct. 10,
1903, reached a stage of 20.3 ft, from floodmarks, discharge,
about 46,000 ft³/s.
EXTREMES FOR PERIOD PRIOR TO REGULATION.--Maximum
discharge, prior to construction of Cannonsville Reservoir in
1963, 28,900 ft³/s, Mar. 22, 1948, gage height, 15.69 ft;
maximum gage height, 15.8 ft, Sept. 30, 1924, from graph based
on gage readings.
PERIOD OF DAILY RECORD1.--WATER TEMPERATURE:
October 1967 to current year (no winter record for water years
1969-77).
INSTRUMENTATION1.--Water-temperature
satellite and telephone telemeter provides 15-minute-interval
readings. From October 1976 to April 1993, water-temperature
recorder provided one-hour-interval readings. Prior to October
1976, water-temperature recorder provided continuous
readings.
REMARKS1.--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 RECORD1.--WATER
TEMPERATURE: Prior to Oct. 1, 2007--Maximum (water years
1968-77, 1979-83, 1985, 1988-96, 1998-2007), 30.5 °C, July 22,
23, 1972, June 16, 1981; minimum (water years 1968, 1978-2007),
0.0 °C on many days during winter periods. WATER TEMPERATURE:
After Oct. 1, 2007--Maximum, 20.3 °C, May 11, 2015; minimum,
-0.1 °C, Dec. 28, 29, 2017.
1 Water-Quality Records
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