This station is operated in cooperation
New York City Department of Environmental
Lat 42°18'30", long 74°23'24"
referenced to North American Datum of 1983, Greene County, NY,
Hydrologic Unit 02020005, on right bank 200 ft southwest of State
Highway 23 at Red Falls, 1.9 mi upstream from mouth, and 2.2 mi
southeast of Prattsville.
PERIOD OF RECORD.--
October 1997 to current year.
Water-stage recorder and crest-stage gage. Datum of gage
is 1,268.54 ft above NAVD of 1988.
Flow regulated to some extent at high flows by three
flood-retardation reservoirs, combined drainage area of 19.2 mi².
Seasonal diversion for snowmaking by Ski Windam ski area at
Water Years 2014-17: Records fair except those for estimated daily
discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--
Maximum discharge, 44,200 ft³/s,
Aug. 28, 2011, gage height, about 20.0 ft, outside gage height was
about 21.4 ft, from floodmarks, from rating curve extended above 2,900
ft³/s on basis of step-backwater analyses at gage heights about 11.4 ft
and about 20.0 ft; minimum discharge, 1.7 ft³/s, Sept. 8, 2007, Sept.
26, 2010; minimum gage height, 0.97 ft, Aug. 9, 2012.
EXTREMES OUTSIDE PERIOD OF RECORD.--
Flood of Jan. 19, 1996,
reached a stage of about 11.4 ft, from floodmark, discharge, 16,400
ft³/s, on basis of step-backwater analysis of peak flow.
Peak Flow and Stage Information