USGS Water-Year Summary 2021
01398500 NORTH BRANCH RARITAN RIVER NEAR FAR HILLS, NJ
LOCATION - Lat 40°42'30", long 74°38'10" referenced to North American Datum of 1983, Far Hills Borough, Somerset County, NJ, Hydrologic Unit 02030105, on left bank 75 ft upstream from Ravine Lake Dam, 1.3 mi southeast of Peapack, 1.6 mi north of Far Hills, and 2.3 mi upstream from Peapack Brook.
DRAINAGE AREA - 26.2 mi².
- WSP 781: Drainage area. WSP 1552: 1922-23, 1924-25(M), 1935(M). WSP 1902: 1954.
PERIOD OF RECORD - Continuous-record discharge station, October 1921 to September 1975, October 1977 to current year. Operated as crest-stage gage, water years 1976-77. Monthly discharge only for some periods, published in WSP 1302.
GAGE - Water-stage recorder with telemetry and crest-stage gage above masonry dam. Datum of gage is 224.49 ft above NGVD of 1929 (New Jersey Geological Survey benchmark). Prior to June 18, 1925, non-recording gage in stilling box at left end of dam at same datum.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 6,390 ft³/s, from rating curve extended above 4,000 ft³/s on basis of flow-over-dam computation of peak flow. Aug 28, 1971, gage height, 7.28 ft; minimum discharge, 0.0 ft³/s, occurred many days while lake was filling.