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USGS Water-Year Summary 2024
01403540 STONY BROOK AT WATCHUNG, NJ
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.
REVISIONS HISTORY - WDR NJ-86-1: 1973 (P).
SURFACE-WATER RECORDS
PERIOD OF RECORD - Continuous-record discharge station October 1974 to current year.
GAGE - Water-stage and precipitation recorder with telemetry and crest-stage gage. Datum of gage is 160.98 ft above NAVD of 1988. Prior to Oct 1, 1996, at datum 10.00 ft higher.
REMARKS - Records fair, except estimated discharges, which are poor. Occasional regulation from Watchung and Best Lakes directly upstream from station and other small lakes. Discharges above 500 ft³/s from rating curve extended on basis of step-backwater computation of peak flow. Channel significantly enlarged and modified in 1991, and modified again in 1997 when the right wall was replaced.
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).
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 6,920 ft³/s, Sept. 01, 2021, gage height, 18.02-ft, from rating curve extended above 500 ft³/s on basis of step-backwater computation of peak flow; maximum gage height, 20.40 ft, Jul 14, 1975, adjusted to current datum; minimum discharge, 0.00 ft³/s, Sep 13, 1982.
