USGS Water-Year Summary 2021
01382800 PEQUANNOCK RIVER AT RIVERDALE, NJ
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.
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.
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.