LOCATION.--Lat 41°56'47.1", long 74°58'46.8" referenced to North American Datum of 1983, Delaware County, NY, Hydrologic Unit 02040102, on left bank 125 ft downstream from bridge on Cooks Brook Road in Cooks Falls, and 5.5 mi downstream from Willowemoc Creek.
DRAINAGE AREA.--241 mi².
PERIOD OF RECORD.--July 1913 to current year.
REVISIONS HISTORY.--WSP 521: Drainage area. WSP 781: 1933(M). WSP 891: 1936-39(M). WSP 1202: 1950. WSP 1232: 1950(M).
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 1,151.70 ft above NGVD of 1929 and 1,151.18 ft above NAVD of 1988 (VERTCON). Prior to Oct. 1, 1933, nonrecording gage at site 125 ft upstream at same datum.
REMARKS.--Water Years 2014-18: Records good except those for estimated daily discharges, which are fair.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 62,400 ft³/s, June 28, 2006, gage height, 20.55 ft, from floodmark in gage house, from rating curve extended above 16,000 ft³/s on basis of slope-area measurement at gage height 15.52 ft; minimum discharge, 16 ft³/s, Nov. 22, 23, 1964.
PERIOD OF DAILY RECORD¹.--WATER TEMPERATURE: October 1987 to September 2009, October 2016 to current year.
REMARKS¹.--Temperature readings prior to Oct. 1, 2007, rounded to the nearest 0.5°C. Interruption of record was due to malfunction of recording instrument.
EXTREMES FOR PERIOD OF DAILY RECORD¹.--WATER TEMPERATURE: Prior to Oct. 1, 2007--Maximum (water years 1991, 1993-97, 1999-2007), 31.5°C, Aug. 12, 2005; minimum, 0.0°C on many days during winter periods. WATER TEMPERATURE: After Oct. 1, 2007--Maximum, 28.6°C, July 16, 2018; minimum, -0.2°C on several days during 2008 winter period.
¹ Water-Quality Records

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