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Oconto is a boat accessible fresh water dive site, located at St. Lawrence Seaway. The maximum depth is over 150ft/46m.

The steamer Oconto was on her first trip carrying a cargo of silks, cotton, boots and 15 passengers. She struck Granite State shoal in July of 1886. There was an unsuccessful salvage attempt and the Oconto slide down the steep side of the channel and eventually broke in two.

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