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USGS Water-Year Summary 2024
01424997 CANNONSVILLE RESERVOIR NEAR STILESVILLE, NY
LOCATION - Lat 42°03'46", long 75°22'49" referenced to North American Datum of 1927, Delaware County, NY, Hydrologic Unit 02040101, in emergency gate tower at Cannonsville Dam on West Branch Delaware River, and 1.8 mi southeast of Stilesville.
DRAINAGE AREA - 454 mi².
REVISIONS HISTORY - WDR NY-71-1: 1966. WDR NY-81-1: 1980-Diversion.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1963 to September 2013 (month-end elevations, contents, and diversions). October 2013 to current year (daily observation elevations).
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by Board of Water Supply, City of New York).
COOPERATION - Elevation record and capacity table provided by New York City Department of Environmental Protection.
REMARKS - Reservoir is formed by an earthfill rockfaced dam. Storage began Sept. 30, 1963. Usable capacity 95,706 mil gal between minimum operating level, elevation 1,040.0 ft, and crest of spillway, elevation 1,150.0 ft. Capacity, at crest of spillway, 98,618 mil gal; at minimum operating level, 2,912 mil gal; at mouth of inlet channel to diversion tunnel, elevation 1,035.0 ft, 1,892 mil gal; in dead storage below release outlet, elevation 1,020.5 ft, 328 mil gal. Figures given herein represent total contents. Reservoir impounds water for diversion (01423900) through West Delaware Tunnel to Rondout Reservoir on Rondout Creek, in Hudson River basin, for water supply to City of New York; for release during periods of low flow in the lower Delaware River basin, as directed by the Delaware River Master; and for conservation release. No diversion prior to Jan. 29, 1964.
Capacity table (elevation, in feet, and total contents, in millions of gallons) Elevation Contents Elevation Contents 1,035.0 1,892 1,115.0 51,949 1,055.0 7,209 1,135.0 76,879 1,075.0 16,689 1,155.0 106,665 1,095.0 31,546 1,160.0 115,198
EXTREMES FOR PERIOD OF RECORD - Maximum contents observed, 111,785 mil gal, June 29, 2006, elevation, 1,158.00 ft; minimum contents observed (after first filling), 6,157 mil gal, Nov. 26, 2001, elevation, 1,051.76 ft.
