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Water-Year Summary for Site 01455400

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00065 Gage height(Max.,Min.)  

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

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USGS Water-Year Summary 2023
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 at left end of Lake Hopatcong Dam on Musconetcong River, 0.9 mi north of Landing, and 2.5 mi northeast of Netcong.
DRAINAGE AREA - 25.3 mi².
REVISIONS HISTORY - WDR NJ-82-2: Drainage area; WDR NJ-83-2: Corrections 1981 (M/m).
PERIOD OF RECORD - Continuous-record reservoir station, February 1887 to current year.
GAGE - Water-stage recorder 1928 to 1984 and water-stage recorder with telemetry 2004 to present year. Prior to June 24, 1928, and during 1985-2004, 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 - From 1887-1928, data provided by Morris Canal employees; 1985-2004, data provided by Lake Hopatcong State Park.
REMARKS - Lake is formed by concrete spillway and earthfill dam completed about 1828. Crest of spillway was lowered 0.11 ft in 1925. Usable capacity, 7,459,000,000 gal between gage height -2.6 ft, sills of gates and 9.00 ft, crest of spillway. Flow regulated by four gates (3 by 5 ft), also by one 24-inch pipe with gate valve to recreation fountain 250 ft downstream from dam. Dead storage, about 8,117,000,000 gal. Figures given herein represent usable capacity. Data collected at 0700 on the first day of the following month between Jan. 1985 and Feb. 2004. Subsequent data collected at 2400 on the last day of each month. Lake used for recreation. Annual extremes beginning in water year 2014 can be obtained by using this link. Prior to water year 2014, annual extremes can be obtained on the respective annual water year summary.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 9,745,000,000 gal, Aug 13, 2000, gage height, 11.80 ft (level of Lake Hopatcong highest since dam was built in 1828); minimum contents, 1,525,000,000 gal, Dec 29, 1960, gage height, 0.65 ft.