SURFACE-WATER RECORDS
LOCATION.--Lat 40°24'54", long 74°20'56" referenced to North American Datum of 1983, Old Bridge Township, Middlesex County, NJ, Hydrologic Unit 02030105, on right end of dam for Deep Run Reservoir, 800 ft upstream of Waterworks Road, 0.9 mi east of Old Bridge, 1.2 mi upstream of mouth, and 3.2 mi south of Sayreville.
DRAINAGE AREA.--16.0 mi².
PERIOD OF RECORD.--Miscellaneous measurements, water year 2000. Continuous-record discharge station, water years 2001 to current year.
REVISED RECORDS.--WDR NJ-03-1: Drainage area. WDR US-2013: 2007, 2010, 2011.
GAGE.--Water-stage and precipitation recorder with telemetry, crest-stage gages and concrete dam. Datum of gage is 1.3 ft above NAVD of 1988 (levels from New Jersey Geological Survey benchmark).
REMARKS.--Records fair, except for estimated discharges and discharges below 1 ft³/s, which are poor. Records given herein represent flow over spillway, flow through sluice gates and leakage. Dam construction for Deep Run Reservoir was completed in 1988. Water diverted for municipal supply by City of Perth Amboy from nearby wells. Discharges above 1,200 ft³/s from rating curve extension on basis of flow over dam computation.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 5,410 ft³/s, Aug 28, 2011, gage height, 9.60 ft, from rating curve extended above 1,200 ft³/s on basis of flow over dam computation, maximum gage height, 10.73 ft, Oct 29, 2012, affected by backwater from tide; minimum discharge, 0.05 ft³/s, estimated leakage when sluice gate is closed and reservoir was below spillway crest, Aug 26, 2016, undetermined amount of negative flow occurred during tidal surge on Oct 29, 2012.

Peak Flood Chart

Rain gage data is available from this location at this link