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Estimated flood stage for this gage is 14.5 feet.
LOCATION. --Lat 40°38'11", long 74°27'05" referenced to North American Datum of 1983, Watchung Borough, Somerset County, NJ, Hydrologic Unit 02030105, on right bank at Watchung Borough Administration Building in Watchung, 150 ft downstream from bridge on Mountain Boulevard, 400 ft downstream from East Branch Stony Brook, and 2.9 mi upstream from confluence with Green Brook.
DRAINAGE AREA. --5.51 mi2.
PERIOD OF RECORD. --October 1974 to current year.
GAGE. --Water-stage recorder and crest-stage gage. Datum of gage is 162.24 ft above NGVD of 1929. Prior to Oct. 1, 1996, at datum 10.00 ft higher.
EXTREMES OUTSIDE PERIOD OF RECORD. --Flood of Aug 2, 1973 reached a stage of 24.5 ft (from floodmark; adjusted to current datum), discharge, 10,500 ft3/s (highest since 1896; from slope-area measurements of peak flow).
COOPERATION. --This gage is funded by U.S. Army Corps of Engineers, Somerset County Board of Chosen Freeholders, and the U.S. Geological Survey. Occasional regulation due to gate operations at lakes upstream of gage.
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Value May 25