USGS Water-Year Summary 2021
01387420 RAMAPO RIVER AT SUFFERN, NY
LOCATION - Lat 41°07'06", long 74°09'37" referenced to North American Datum of 1983, Rockland County, NY, Hydrologic Unit 02030103, on left bank 145 ft downstream from highway bridge on New York State Thruway at Suffern, and 1.1 mi upstream from Mahwah River.
DRAINAGE AREA - 93 mi².
- WDR NY-00-1: 1999 (M).
PERIOD OF RECORD - June 1979 to current year.
GAGE - Water-stage recorder, crest-stage gage, and concrete control. Datum of gage is 264.44 ft above NGVD of 1929 and 263.29 ft above NAVD of 1988.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge, 6,600 ft³/s, Mar. 12, 1936, by computation of flow over dam at site 0.65 mi upstream, drainage area, 90.6 mi².
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 14,700 ft³/s, Aug. 28, 2011, gage height, 18.88 ft, on basis of runoff comparisons with nearby stations; minimum discharge, 1.7 ft³/s, Sept. 7, 1995, gage height, 1.04 ft.