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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
01381500 WHIPPANY RIVER AT MORRISTOWN, NJ
LOCATION - Lat 40°48'26", long 74°27'25" referenced to North American Datum of 1983, Hanover Township, Morris County, NJ, Hydrologic Unit 02030103, on left bank at Morristown sewage-treatment plant, 0.8 mi northeast of Morristown, and 9.0 mi upstream from mouth.
DRAINAGE AREA - 29.4 mi².
REVISIONS HISTORY - WSP 781: Drainage area. WSP 1552: 1922-23(M), 1924, 1925-27(M) 1928-29, 1930-32(M), 1933-34. WDR NJ-1974: 1965. WDR NJ-84-1: 1971(M).
SURFACE-WATER RECORDS
PERIOD OF RECORD - Continuous-record discharge station, August 1921 to current year.
GAGE - Water-stage recorder with telemetry and crest-stage gage. Concrete control since July 1, 1936. Datum of gage is 260.01 ft above NGVD of 1929 (levels from New Jersey Geological Survey benchmark). Prior to July 16, 1930, non-recording gage at same site and datum.
REMARKS - Records good, except for estimated discharges, which are fair. Flow occasionally regulated by operation of gates in Pocahontas Dam, 2.5 miles upstream of gage and Speedwell Lake 3.4 mi upstream of gage. Storm sewers entering the river in Morristown can cause sharp rises in stage. Diurnal fluctuations at low flow possibly due to upstream sewage-treatment plants effluent patterns. Water diverted upstream at Clyde Potts Reservoir on Harmony Brook for municipal supply by the Southeast Morris County Municipal Utilities Authority.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 3,780 ft³/s, Aug 28, 2011, gage height, 9.58 ft, from rating curve extended above 1,400 ft³/s; minimum discharge, 2.7 ft³/s, Oct 25, 2012.
