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.
On the Granite State Shoals in the American Narrows of the seaway and across the channel from the Rock Island Light.
Depth 175 ft (53.3 m)