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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.

USGS 01403540 Stony Brook at Watchung NJ


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Estimated flood stage for this gage is 14.5 feet.

Rain gage data is available from this location at this link.

gage photoLOCATION. --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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This station managed by the New Jersey Water Science Center.

Available Parameters Available Period
All 2 Available Parameters for this site
00060 Discharge 2007-10-01  2016-09-30
00065 Gage height 2007-10-01  2016-09-30

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Discharge, cubic feet per second

Most recent instantaneous value: 0.69   09-30-2016   16:30 EDT
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Daily discharge, cubic feet per second -- statistics for Sep 30 based on 40 years of record more
Most Recent
Value Sep 30
Median Mean 75th
0.26 0.69 1.2 2.0 3.6 3.7 33

Gage height, feet

Most recent instantaneous value: 9.50   09-30-2016   16:30 EDT
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