During winter months, cold and ice may
result in inaccurate real-time gage height and streamflow data.
Adjustments or deletions of this data can only be done after detailed
Funding for this site is provided by:
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.
PERIOD OF RECORD.--
Continuous-record discharge station, August
1921 to current year.
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).
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
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
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.
National Weather Service flood stage for
this gage is 6 ft.