LOCATION.--Lat 43°09'44.4", long
76°21'45.7" referenced to North American Datum of
1983, Onondaga County, NY, Hydrologic Unit 04140201, on left
bank at downstream side of bridge on State Highway 690 and 1.6
mi upstream from Baldwinsville.
DRAINAGE AREA.--3,130 mi².
PERIOD OF RECORD.--November 1949 to current year.
November 1898 to December 1908, prior to construction of Erie
(Barge) Canal, not equivalent to later records because of
extensive development of Erie (Barge) Canal system. January
1909 to September 1925 (gage heights only) in reports of State
Engineer and Surveyor. Prior to October 2014, published as
"at Baldwinsville" (04237500).
GAGE.--Acoustic velocity meter and water-stage recorder.
Datum of gage is 370.00 ft above NAVD of 1988. Prior to Apr. 1,
2019, at datum 70.00 ft lower. Prior to October 2014, base
water-stage recorder at site 1.6 mi downstream and, prior to
October 1996, auxiliary water-stage recorder at site 1,500 ft
downstream from base gage at datum 360.80 ft above NAVD of 1988
(VERTCON), 361.38 ft above NGVD of 1929, and 362.60 ft above
Erie (Barge) Canal Datum. Prior to Dec. 31, 1908, nonrecording
gage at site 1.6 mi downstream at different datum.
COOPERATION.--New York State Canal Corporation.
REMARKS.--Records from November 1898 to December 1908
determined on basis of head on dam, flow through 10 mills
nearby, lockages at Oswego Canal lock, estimated leakage of
dam, wheel gates, flumes, and penstocks; not adjusted for
inflow from Lake Erie through Erie (Barge) Canal. Records from
November 1949 to September 1996, computed by using fall as
determined by auxiliary water-stage recorder. Records from
October 1996 to September 2014, computed by using standard
stage-discharge methods. Low and medium flows from November
1949 to September 2014, affected by large diurnal fluctuations
caused by powerplants upstream from station at site then in
use. Published record, November 1949 to September 2014,
represents the total flow at Baldwinsville and includes flow in
Erie (Barge) Canal. Low and medium flows at present site can be
affected by operation of powerplants and Lock 24 on Erie
(Barge) Canal 1.6 mi downstream from gage. Seneca River basin
receives water from Erie (Barge) Canal through Lock 32 near
Pittsford. A large amount of natural storage and some
artificial regulation is afforded by many large lakes and the
Erie (Barge) Canal system in the river basin. From 1931-98, a
large part of flow from 45.5 mi² of Mud Creek drainage area
(Susquehanna River basin) had been diverted into Keuka Lake
(Oswego River basin) for power generation.
Water Years 2014-20: Records good except those for estimated
daily discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum daily discharge,
18,100 ft³/s, Apr. 27, 1993; minimum daily discharge, 34 ft³/s,
Sept. 17, 1985, result of extreme regulation. Maximum and
minimum instantaneous discharges not determined.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum daily
discharge, 22,100 ftÂ³/s, Mar. 25, 1936, provided by New York
State Department of Transportation.