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The gage height of the crest of the dam at Lake Hopatcong is 9.0 feet. NJ State Police high-water level is 9.5 feet. At lake levels above the high-water level, boat speeds are greatly restricted and no wakes are allowed.
This gage is funded by the New Jersey Department of Environmental Protection, Division of Watershed Management.
LOCATION. --Lat 40°55'03", long 74°39'51" referenced to North American Datum of 1983, Roxbury Township, Morris County, NJ, Hydrologic Unit 02040105, in gatehouse of Lake Hopatcong Dam on Musconetcong River at Landing.
DRAINAGE AREA. --25.3 mi2.
PERIOD OF RECORD. --February 1887 to current year.
GAGE. --Staff gage and water-stage recorder re-installed March 12, 2004. Prior to June 24, 1928, daily readings obtained by measuring from high-water mark to water surface converted to gage height, present datum. Datum of gage is 914.57 ft above National Geodetic Vertical Datum of 1929.
COOPERATION. --Lake Hopatcong Commission.
EXTREMES FOR PERIOD OF RECORD. --Maximum contents, 9,745,000,000 gal, Aug. 13, 2000, gage height, 11.80 ft; minimum, 1,525,000,000 gal, Dec. 29, 1960, gage height, 0.65 ft.