SURFACE-WATER RECORDS
LOCATION.--Lat 40°59'55", long 74°17'53" referenced to North American Datum of 1983, Morris County, NJ, Hydrologic Unit 02030103, at downstream side of bridge on Paterson-Hamburg Turnpike in Riverdale, 0.6 mi upstream from Wanaque River, and 2.8 mi upstream of mouth.
DRAINAGE AREA.--83.9 mi².
PERIOD OF RECORD.--Annual maximum gage, water years 1981-82. Occasional low-flow measurements, water years 1963, 1998, 2001-02, 2005. Continuous-record discharge station, water years 1993-97, and August 2011 to current year.
GAGE.--Water-stage recorder with telemetry and crest-stage gage. Datum of gage is 187.90 ft above NGVD of 1929. Prior to August, 2011 gage located on right bank 5 ft upstream of bridge on Paterson-Hamburg Turnpike at same datum.
REMARKS.--Records fair, except for estimated discharges, which are poor. Flow regulated by Canistear, Oak Ridge, Clinton, Charlotteburg, and Echo Lake Reservoirs. Water diverted at Charlotteburg Reservoir for municipal supply for city of Newark.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,900 ft³/s, Aug 28, 2011, gage height, 12.57 ft; minimum discharge, 3.6 ft³/s, Sep 8, 1995.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Apr. 5, 1984, reached a stage of 11.5 ft (downstream side of bridge) and 13.6 ft (upstream side of bridge), from floodmarks.

Peak Flood Chart

National Weather Service flood stage for this gage is 8 ft.