The first concept of making Michigan’s Isle Royale, the largest island in Lake Superior, into a national park came in 1931 by it wasn’t until 1940 that the park was created. It was in March 1931 that Congress authorized Isle Royale to become a national park. President at the time was Herbert Hoover and he signed the bill into law. But that act was not a federal magic wand. There was much to do before Isle Royale could make its public debut. The first obstacle was actually owning the land.