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USGS 01381500 Whippany River at Morristown NJ


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Gage Photo 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.
PERIOD OF RECORD.--Continuous-record discharge station, August 1921 to current year.
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).
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.

Web Camera
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Peak Flood Chart

National Weather Service flood stage for this gage is 6 ft.

This station managed by the New Jersey Water Science Center.

Available Parameters Available Period
1981-10-01  2022-09-26
2007-10-01  2022-09-26


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

Discharge, cubic feet per second

Most recent instantaneous value: 20.9 09-26-2022   05:50 EDT
Graph of  Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for Sep 26 based on 98 water years of record more
Median Most Recent
Value Sep 26
Mean Max
4.60 14 20 20.9 29 36 425

Gage height, feet

Most recent instantaneous value: 1.93 09-26-2022   05:50 EDT
Graph of  Gage height, feet

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