How deep is Lake Ontario?

By Forinfos - 30/04/2026 - 0 comments

Lake Ontario measures 802 feet at its greatest depth and has an average depth of 283 feet. Its basin holds 393 cubic miles of water.

Lake Ontario is the third deepest of the five Great Lakes as measured by greatest depth. Lake Superior and Lake Michigan are deeper at 1,333 feet and 923 feet respectively. Lake Ontario is deep enough to prevent it from freezing completely in the winter.

Lake Ontario is the fourth largest Great Lake by volume with only Lake Erie containing less water. In comparison, Lake Ontario is the smallest Great Lake by surface area at 7,340 square miles. Worldwide, Lake Ontario is the 17th largest lake by surface area.

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