Funding for this site is provided by:
44°27'05", long 73°38'33" referenced to North
American Datum of 1983, Clinton County, NY, Hydrologic Unit 04150404,
on left bank 1.8 mi downstream from confluence of East and West
Branches, and 1.8 mi east of Au Sable Forks.
PERIOD OF RECORD.--
August 1910 to September 1968, March 1990 to
current year. Prior to October 1924, published as "at Au Sable
Forks". Monthly discharge only for winter periods during 1911 and
1913 water years, published in WSP 1307.
WSP 1307: 1911-19 (M), 1922-24 (M).
Water-stage recorder and crest-stage gage. Datum of gage
is 505.65 ft above NGVD of 1929 and 505.37 ft above NAVD of 1988. Prior
to Oct. l, 1924, nonrecording gage at site 1.5 mi upstream at different
Occasional regulation by Fern Lake and Taylor Pond in
Black Brook basin and Upper and Lower Ausable Lakes.
Water Years 2014-17: Records good except those for estimated daily
discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--
Maximum discharge, 46,500 ft³/s,
Aug. 28, 2011, gage height, 15.54 ft, from rating curve extended above
16,000 ft³/s on basis of runoff comparison of peak flows from
contracted-opening measurements at gage heights 13.83 ft and 15.54 ft
at site 3.9 mi downstream; minimum discharge, practically no flow July
21, 1912, result of unusual regulation.
EXTREMES OUTSIDE PERIOD OF RECORD.--
Flood of Feb. 23, 1990 (ice
jam), reached a stage of 14.5 ft, from floodmark 200 ft upstream from
Peak Flow and Stage Information