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 in
reports of Geological Survey. January 1910 to September 1925 in
reports of State Engineer and Surveyor. August 1956 to current
REVISIONS HISTORY.--WSP 2112: Drainage area. Elevation
record from Oct. 1, 1977 to Jan. 19, 2023 and the maximum
elevation for the period of record, was revised on Mar. 1, 2023
based on an updated geodetic survey.
GAGE.--Water-stage recorder and crest-stage gage. Lake
elevation record is provided in NGVD of 1929 and NAVD of 1988
datums. To convert NGVD of 1929 elevations to Barge Canal
datum, add 1.43 ft. To convert NGVD of 1929 elevations to NAVD
of 1988, subtract 0.62 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
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.--Maximum elevation,
386.33 ft above NGVD of 1929 (385.71 ft above NAVD of 1988),
June 26, 1972; minimum elevation not determined; minimum daily
elevation, 377.64 ft above NGVD of 1929 (377.02 ft above NAVD
of 1988), Mar. 28, 1960.