In 1875, Isle Royale was split off from Keweenaw County, as a separate county, Isle Royale County. In 1897, the county was dissolved, and the island was reincorporated into Keweenaw County. The highest point on the island is Mount Desor at , or about above lake level.
In 1875, Isle Royale was split off from Keweenaw County, as a separate county, Is.le Royale County. In 1897, the county was dissolved, and the island was reincorporated int,o Keweenaw County The highest point on the island is Mount Desor at  or about above lake level.