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LOCATION.--Lat 41°34'21", long 74°47'00" referenced to North American Datum of 1927, Sullivan County, NY, Hydrologic Unit 02040104, at dam on Mongaup River, and 1.8 mi northwest of Fowlersville.
DRAINAGE AREA.--116 mi². excluding Cliff Lake, Lebanon Lake, and Toronto Reservoir.
PERIOD OF RECORD.--January 1930 to September 2013 (month-end elevations and contents). October 2013 to current year (daily observation elevations).
REVISIONS HISTORY.--WSP 1552: 1951-54. WDR NY-86-1: 1985. WDR NY-90-1: Drainage area.
GAGE.--Nonrecording gage read daily. Datum of gage is NGVD of 1929 (levels by Orange and Rockland Utilities, Inc.).
COOPERATION.--Elevation record and capacity table (1952) provided by Eagle Creek Renewable Energy.
REMARKS.--Reservoir is formed by an earthfill dam. Storage began Jan. 19, 1930. Usable capacity, 1,436.6 mil ft³ between elevations 1,010.0 ft, minimum operating pool, and 1,071.2 ft, top of flashboards. Capacity below elevation 1,010.0 ft, minimum operating pool, about 212.7 mil ft³. Figures given herein represent usable contents above 1,010.0 ft. Reservoir is used for storage of water for power. Water is received from Cliff Lake, Lebanon Lake, and Toronto Reservoir. The reservoir level was lowered 40 ft due to a sinkhole discovered on May 25, 2005. The sinkhole was repaired and the reservoir refilled by July 2007.
Capacity table (elevation, in feet, and usable contents, in millions of cubic feet)

Elevation  Contents      Elevation  Contents
1,010.0      0.0         1,050.0      693.3
1,020.0    100.5         1,060.0    1,010.3
1,030.0    239.3         1,070.0    1,387.3
1,040.0    436.3         1,076.0    1,642.3

EXTREMES FOR PERIOD OF RECORD.--Maximum contents observed, 1,461.6 mil ft³, Mar. 14, 1977, elevation, 1,071.8 ft; minimum contents observed (after first filling), -141.4 mil ft³, Dec. 2, 1938, elevation, 987.5 ft.

Gage PhotoStation image


This station managed by the NY Water Science Center Troy.

Available Parameters Period of Record
2013-10-01  2020-03-25


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Summary of all available data for this site
Instantaneous-data availability statement

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