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LOCATION.--Lat 42°34'13", long 78°02'32" referenced to North American Datum of 1983, Wyoming County, NY, Hydrologic Unit 04130002, on left bank at Portageville, 500 ft downstream from bridge on State Highway 436, 800 ft upstream from abandoned railroad bridge piers, 0.9 mi upstream from Upper Falls, and 89.8 mi upstream from mouth.
DRAINAGE AREA.--984 mi2.
PERIOD OF RECORD.--August 1908 to current year. Prior to December 1945, published as "at St. Helena". Records published for both sites December 1945 to September 1950.
REVISED RECORDS.--WSP 264: 1908. WSP 564: 1916 (M). WDR NY-82-3: Drainage area. WDR NY-72-1: 1950 (M), 1951 (M), 1956 (M), 1959 (M), 1964 (M), 1967 (M).
GAGE.--Water-stage recorder. Datum of gage is 1,080.00 ft above NGVD of 1929 (levels by Corps of Engineers). Prior to Aug. 24, 1911, nonrecording gage, and Aug. 24, 1911 to Sept. 30, 1946, water-stage recorder, at site 8 mi downstream at different datum. Oct. 1, 1946 to June 21, 1972, water-stage recorder at site 1,200 ft downstream at datum 2.60 ft higher (destroyed by flood of June 1972). June 21, 1972 to July 11, 1972, nonrecording gage at same site and datum. July 12, 1972 to May 18, 1973, nonrecording gage at site 500 ft upstream at datum 11.48 ft higher.
REMARKS.--Since July 1928, some seasonal regulation by Rushford Lake. Diurnal fluctuation at low flow caused by powerplant. Monthly figures of discharge and runoff 1952 to 1966 water years adjusted for change in contents in Rushford Lake. Water Years 2014-15: Records good except those for estimated daily discharges, which are fair.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, about 90,000 ft3/s, June 23, 1972, gage height, 35.25 ft, at site 1,200 ft downstream at datum 2.60 ft higher, from floodmark, from rating curve extended above 25,000 ft3/s on basis of contracted-opening measurement of 71,000 ft3/s, 0.4 mi upstream, and contracted-opening measurement of 98,200 ft3/s, 0.7 mi downstream from gage; minimum discharge, 18 ft3/s, Oct. 5, 17, 1913, gage height, 1.70 ft, site and datum then in use.

Peak Flow and Stage Information
This station managed by the NY Water Science Center, Ithaca.

Available Parameters Available Period
All 2 Available Parameters for this site
00060 Discharge 2007-10-01  2016-08-31
00065 Gage height 2016-05-03  2016-08-31

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Discharge, cubic feet per second

Most recent instantaneous value: 120   08-31-2016   22:00 EST
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Daily discharge, cubic feet per second -- statistics for Aug 31 based on 108 years of record more
Most Recent
Value Aug 31
Median 75th
Mean Max
40 112 120 159 294 338 3890

Gage height, feet

Most recent instantaneous value: 8.29   08-31-2016   22:00 EST
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