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During the winter season, ice conditions may interfere with the acoustic signal used to measure flow velocity at this site. In these instances, the resultant discharge may be less accurate than discharge computed during open-water conditions.

This station is operated in cooperation with:
   NYS Department of Environmental Conservation
   U.S. Army Corps of Engineers - Buffalo District
   U.S. Geological Survey

LOCATION.--Lat 43°08'30.2", long 77°36'58.7" referenced to North American Datum of 1983, Monroe County, NY, Hydrologic Unit 04130003, on left bank, adjacent to floodwall, about 400 ft upstream of the Ford Street bridge, in Rochester.
DRAINAGE AREA.--2,474 mi2.
PERIOD OF RECORD.--April 1904 to September 1918, December 1919 to current year. Published as 04231500, "below Erie Canal at Rochester," 1904-18, as 04232000, "at Driving Park Avenue," 1919-68, and "at Rochester," 1969-2005.
GAGE.--Acoustic velocity meter and water-stage recorder. Acoustic velocity meter since 2005. Datum of gage is Barge Canal Datum (1.08 ft below NGVD of 1929). April 1904 to December 1910, nonrecording gage, and December 1910 to September 1918, water-stage recorder, at site 1.9 mi upstream at datum 506.85 ft, Barge Canal datum. December 1919 to Apr. 4, 1927, in plant 5, and Apr. 4, 1927 to June 19, 1956, at site 3.1 mi downstream at datum 250.00 ft above NGVD of 1929. June 20, 1956 to Sept. 30, 1969, at site 3.1 mi downstream at datum 247.00 ft above NGVD of 1929. Oct. 1, 1969 to Sept. 30, 1985, at site 3.1 mi downstream at datum 246.24 ft above NGVD of 1929. Oct. 1, 1985 to Sep. 30, 2005, at site 3.1 mi downstream at datum 244.24 ft above NGVD of 1929 (245.00 ft Barge Canal datum).
REMARKS.--Records good except those below 800 ft3/s, which are fair, and those for estimated daily discharges, which are poor. Occasional fluctuation caused by powerplant downstream from station. New York State Erie (Barge) Canal crosses river 1.8 mi upstream from station. Water diverted by the canal from Lake Erie is discharged into river from the west, the canal again diverting a smaller amount of water from river to the east. Additional regulation is provided by Rushford Lake, Mount Morris Lake (station 04224000), and Conesus Lake (station 04227980). Telephone and satellite gage height and velocity telemeters at station.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, since construction of Mt. Morris Reservoir in 1951, 29,600 ft3/s, June 25, 1972, gage height, 15.89 ft, site and datum then in use.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum discharge, about 54,000 ft³/s, Mar. 18, 1865.
EXTREMES FOR PERIOD PRIOR TO REGULATION.--Maximum discharge, prior to construction of Mt. Morris Reservoir in 1951, 48,300 ft3/s, Mar. 30, 1916, gage height, 15.3 ft, site and datum then in use; minimum discharge (at gage site located 3.1 mi downstream), less than 10 ft3/s, occurred during low-water periods in some years when power plant was shut down.
INSTRUMENTATION1.--ISCO refrigerated automatic sampler since August 2010. A YSI 6920-V2 or 6600 continuous monitor with water temperature, specific conductance, pH, dissolved oxygen and turbidity since December 2010 provides 15-minute-interval readings.
EXTREMES FOR PERIOD OF DAILY RECORD1.--WATER TEMPERATURE: Maximum, 29.9°C, July 24, 2011; minimum, -0.1°C, on many days.
SPECIFIC CONDUCTANCE: Maximum, 904 µS/cm @ 25°C, Feb. 28, 2013; minimum, 245 µS/cm @ 25°C, Feb. 5, 2013. pH: Maximum, 8.6 , July 17, 19, 2011; minimum, 7.3, Sept. 2, 5, 7, 2012. DISSOLVED OXYGEN: Maximum, 14.8 mg/L, July 17, 2011; minimum, 4.6 mg/L, Jul. 30, 2013. TURBIDITY: Maximum, 1,070 FNU, Jan. 20, 2012; minimum, 2.1 FNU, Sept. 30, 2013.
1 Water-Quality Records
Derived from NY Annual Water-Data Report 2013

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

Available Parameters Available Period
All 9 Available Parameters for this site
00060 Discharge 2007-10-01  2016-02-10
00055 Stream velocity 2015-10-13  2016-02-10
00010 Temperature, water 2010-12-16  2016-02-10
00095 Specific cond at 25C 2010-12-16  2016-02-10
00400 pH 2010-12-16  2016-02-10
63680 Turbidity, Form Neph 2010-12-16  2016-02-10
00300 Dissolved oxygen 2010-12-16  2016-02-10
99234 Autosampler count 2015-10-13  2016-02-10
00065 Gage height 2015-10-13  2016-02-10

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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: 2,230   02-10-2016  02:30 EST
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Daily discharge, cubic feet per second -- statistics for Feb 10 based on 7 years of record more
Median Most Recent
Value Feb 10
Mean 75th
981 1290 2180 2230 3530 6870 9620

Gage height, feet

Most recent instantaneous value: 512.51   02-10-2016  02:30 EST
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