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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 analysis.
National Weather Service flood stage for this gage is 19.0 ft.
Forecasts for this gage are issued by the National
Weather Service routinely year-round.
LOCATION.--Lat 40°51'45", long 74°19'18" referenced to North American Datum of 1983, Montville Township, Morris County, NJ, Hydrologic Unit 02030103, on left bank, 20 ft downstream from bridge on U.S. Route 46, 0.5 mi east of Pine Brook, and 1.3 mi downstream from Rockaway River.
DRAINAGE AREA.--349 mi2.
PERIOD OF RECORD.--Occasional low-flow measurements, water years 1963-69, 1973. Annual maximum, water years 1966-75, 1978-79. Continuous-record gaging station, water years 1979 to current year. Feb 19 to Aug 24, 1939 in files of U.S. Army Corps of Engineers, New York District.
GAGE.--Water-stage recorder, velocity meter, and crest-stage gage. Datum of gage is 149.26 ft above NGVD of 1929. December 1965 to September 1979, crest-stage gage at same site at datum 10.00 ft higher. Feb 19 to Aug 24, 1939, water-stage recorder at present County Route 506 bridge, 1,600 ft upstream from gage, operated by U.S. Army Corps of Engineers, New York District at datum 13.05 ft higher.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage since at least 1810 (according to State Geologist's report for 1904), 23.2 ft, Oct 10, 1903 (from King Survey of high-water marks; present datum; at bridge on County Route 506 (Bloomfield Avenue), 1,600 ft upstream from gage). Floods of Mar 13, 1936 and Sep 24, 1938 reached stages of 20.8 ft and 19.4 ft, respectively (present datum; at bridge on County Route 506). Flood of Jul 23, 1945 reached a stage of 22.3 ft (according to U.S. Army Corps of Engineers; present datum). Minimum discharge measured, 41 ft3/s, Sep 22, 1964.
COOPERATION.--Funding for this gage is provided by the New Jersey Department of Environmental Protection and the U.S. Geological Survey.
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