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  • UPDATE, 11/9: As of November 8, the USGS has successfully restored all of the operational gages that stopped transmitting due to an issue with the satellite telemetry system that records and transmits data. The USGS will now focus on restoring other equipment that experienced the telemetry issues, including about 85 rapid deployment gages that are used periodically for emergency response. Read more
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LOCATION.--Lat 42°40'55", long 77°49'44" referenced to North American Datum of 1983, Livingston County, NY, Hydrologic Unit 04130002, on left bank 200 feet upstream from bridge on State Highway 36, at Sonyea.
DRAINAGE AREA.--68.3 mi².
PERIOD OF RECORD.--March 1911 to December 1913 (published as "at Sonyea"), September 1915 to December 1916 (published as "near Sonyea") seasonal records only.  August 1917 to September 1932, November 1974 to September 1977, April 2016 to current year.  Occasional discharge measurements, water years, 1954, 1957-62,1964, and 1965. 
REVISIONS HISTORY.--WDR NY-75-1: Drainage area.
GAGE.--Water-stage recorder.  Datum of gage is 583 ft above NAVD of 1988, from topographic map.  Prior to April 2016, water-stage recorder at site 400 ft upstream at different datum.  Prior to Sept. 30, 1932, nonrecording gages at different sites and datum.
COOPERATION.--In cooperation with the U.S. Environmental Protection Agency's Great Lakes Restoration Initiative (GLRI) and New York State Department of Corrections and Community Supervision.
REMARKS.--Water Years 2016-17:  Records fair except those for estimated daily discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,280 ft³/s Sept. 25, 1977, gage height 6.69 ft, site and datum then in use; minimum discharge, about 0.1 ft³/s Sept. 8-21, 1932, at site then in use.
PERIOD OF DAILY RECORD1.--WATER TEMPERATURE: April 2016 to current year. SPECIFIC CONDUCTANCE: April 2016 to current year. pH: April 2016 to current year. DISSOLVED OXYGEN: April 2016 to current year. TURBIDITY: April 2016 to current year.
INSTRUMENTATION1.--Multi-parameter water-quality sonde measures water temperature, specific conductance, pH, dissolved oxygen, and turbidity at 15-minute intervals since April 2016.
EXTREMES FOR PERIOD OF DAILY RECORD1.--WATER TEMPERATURE: Maximum, 29.7°C, Aug. 13, 2016; minimum, 0.0°C, on many days during winter. SPECIFIC CONDUCTANCE: Maximum, 604 uS/cm @ 25°C, Nov. 23, 2016; minimum, 168 uS/cm @ 25°C, Apr. 20, 2017. pH: Maximum, 8.7 , May 11, 12, 2017; minimum, 7.6, Jun. 15,16, 2017. DISSOLVED OXYGEN: Maximum, 15.3 mg/L, Mar. 13, 2017; minimum, 6.2 mg/L, Aug. 5, 6, 13, 2016. TURBIDITY: Maximum, 3770 FNU, June 15, 2017; minimum, 0.1 FNU, on many days in 2017.
1 Water-Quality Records

Gage PhotoStation image


Available Parameters Available Period
All 7 Available Parameters for this site
00010 Temperature, water 2016-04-05  2018-11-15
00060 Discharge 2016-04-01  2018-11-15
00065 Gage height 2016-04-01  2018-11-15
00095 Specific cond at 25C 2016-04-05  2018-11-15
00300 Dissolved oxygen 2016-04-05  2018-11-15
00400 pH 2016-04-05  2018-11-15
63680 Turbidity, Form Neph 2016-04-05  2018-11-15

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Summary of all available data for this site
Instantaneous-data availability statement

Discharge, cubic feet per second

Most recent instantaneous value: 68.2 11-15-2018   21:45 EST
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Daily discharge, cubic feet per second -- statistics for Nov 15 based on 19 years of record more
Median Mean 75th
Most Recent
Value Nov 15
4.60 8.6 16 21 25 68.2 90.0

Gage height, feet

Most recent instantaneous value: 0.94 11-15-2018   21:45 EST
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