LOCATION.--Lat 44°27'06.3", long
73°38'33.6" 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.
DRAINAGE AREA.--446 mi².
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.
REVISIONS HISTORY.--WSP 1307: 1911-19 (M), 1922-24 (M).
Gage height and discharge for the period Aug. 1, 2022 to Aug.
8, 2023 were revised on Feb. 15, 2024, based on new gage height
correction applied.
GAGE.--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 datum.
REMARKS.--Minor storage in several lakes in the
headwaters of the basin. During the 1920s to 1950s, flows could
have been affected by operation of a hydroelectric plant (Nye
Dam) near Upper Jay. Storage in Taylor Pond in the Black Brook
basin; formerly regulation due to hydroelectric plant at
site (dates unknown). Regulation from pulp and paper mill
operations at Rome Dam, 3.2 mi upstream on the West Branch,
from 1893 to 1971.
Water Years 2014-23: 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 gage.
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