I found two books that make reference to it...

Non-fiction:
Cats to Kings: From Charlie Tiepner to D. Wayne Lukas - A Look at Racing in the Northwoods By Lisa Haefs

This one actually links the place to Jimmy Hoffa. In fact it says that "it was reportedly one of the first places they looked for his body"

and

Fiction:
The Spymaster By Donald Freed (ebook)