LOCATION.--Lat 42°26'45", long
76°30'44" referenced to North American Datum of 1983,
Tompkins County, NY, Hydrologic Unit 04140201, on left bank of
old inlet channel, in vestibule of restaurant, 200 ft upstream
from flood-control channel of Cayuga Inlet, at north end of
Taughannock Boulevard, at Ithaca.
DRAINAGE AREA.--143 mi². (Cayuga Inlet), Cayuga Lake at
mouth 1,564 mi²; Cayuga Lake portion 785 mi².
PERIOD OF RECORD.--August 1905 to December 1909, August
1956 to current year in reports of Geological Survey (daily
gage heights prior to October 1975, elevations thereafter).
January 1910 to September 1925 in reports of State Engineer and
REVISIONS HISTORY.--WSP 2112: Drainage area.
GAGE.--Water-stage recorder. Datum of gage is NGVD of
1929 (1.43 ft Barge Canal datum). To convert elevations to NAVD
of 1988, subtract 0.64 ft. Prior to September 1925,
nonrecording gages at several sites within 1 mi of present
site. August 1956 to September 2000, at site 100 ft downstream.
Prior to October 1968, at datum 378.57 ft higher. October 1968
to September 1975, at datum 376.57 ft higher.
REMARKS.--Lake elevation regulated at north end of lake
by dam and Lock 1 (Mud Lock) on Cayuga-Seneca Canal. Area of
water surface, 66.9 mi². Seneca River (Cayuga-Seneca Canal)
enters lake 0.5 mi upstream from Mud Lock and is included in
second drainage area given above.
EXTREMES FOR PERIOD OF RECORD.--(1905-25 and since
1956): Maximum elevation, 386.46 ft, Apr. 26, 1993; minimum
elevation not determined; minimum daily elevation, 377.64 ft,
present datum, Mar. 28, 1960.