LOCATION.--Lat 44°03'09.9", long 73°27'12.6" referenced to North American Datum of 1983, Essex County, NY, Hydrologic Unit 04150408, on west shore at boat launch near mouth of Mill Brook and 0.5 mi north of railroad station, in Port Henry.
PERIOD OF RECORD.--October 1997 to September 1999, April 2015 to current year.
REVISIONS HISTORY.--Temperature data for the period Aug. 5, 2021, to Aug. 17, 2021, were revised on Feb. 28, 2023, due to incorrect data being deleted. Temperature records for the period Oct. 26, 2017 to Jan. 12, 2021 were revised on Mar. 24, 2023, after data were found outside the allowable limits.
GAGE.--Water-stage recorder and digital weighing precipitation gage. Datum of gage is NGVD of 1929. To convert elevations to NAVD of 1988, subtract 0.60 ft.
REMARKS.--Area of lake surface about 490 mi². Total volume below 92.5 ft elevation, reported by Lake Champlain Studies Center, 902.2 bil ft³.
EXTREMES FOR PERIOD OF RECORD.--Maximum elevation, 101.90 ft, Apr. 4, 5, 1998; minimum, 93.23 ft, Oct. 16, 2016.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum elevation, about 103.1 ft, during period May 6-9, 2011, from floodmark.
PERIOD OF RECORD (CLIM).--April 2015 to current year.
INSTRUMENTATION (CLIM).--Unshielded, 400 square centimeter collecting area, digital weighing precipitation gage, mounted on pedestal with top of collector 5 ft above ground.
EXTREMES FOR PERIOD OF RECORD (CLIM).--Maximum daily precipitation, 5.36 inches, Oct. 31, 2019.
PERIOD OF DAILY RECORD¹.--WATER TEMPERATURE: October 1997 to September 1999, October 2017 to current year.
EXTREMES FOR PERIOD OF DAILY RECORD¹.--WATER TEMPERATURE: Maximum, 26.6°C, July 17, 2022; minimum, 0.0°C on several days during winter periods.
¹ Water-Quality Records

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