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LakeLevelToday

Lake Ontario Water Level Today

Lake Ontario averaged 245.34 ft across the lake on Oct 23, according to the U.S. Army Corps of Engineers.

245.34 ft
Lake-wide average, Oct 23, above IGLD 1985
not reported
October average so far
230240250260270
Last 7 days
−0.20 ft
Last 30 days
−0.79 ft
October vs. long-term average
not reported
October vs. a year ago
not reported

Updated Oct 23. Source: U.S. Army Corps of Engineers, Detroit District, lake-wide averages coordinated with Canada; values from Oct 17 on may still be revised. Long-term averages and records cover 1918–2025. The Army Corps of Engineers now lists Lake Ontario as Lake America in its water data.

Lake Ontario monthly levels

243244245246247248’21’22’23’24’25’26
Monthly averageLong-term average for the month, 1918–2025

Feet above IGLD 1985. The newest month is the average so far. Source: U.S. Army Corps of Engineers.

Forecast

The Army Corps and Canada publish a six-month water level forecast for each Great Lake in their monthly bulletin. We don’t show it here yet; see the monthly Great Lakes water level bulletin.

The other Great Lakes

LakeLevelToday is not an official warning source. For marine forecasts and flood warnings on Lake Ontario, check the National Weather Service.