This is a story 'bout Minnie the Monster.
Sorry! I couldn't resist that. Readers of my generation will recognize a parody of a popular song. In any case, one of the strange mysteries of cryptozoology is how certain lakes gain a reputation as being the habitation of a monster, which only reappear at very long intervals. Take Lake Minnetonka, Minnesota, for example. It's adjacent to the huge St. Paul-Minneapolis conurbium, for heaven's sake! - hardly the site you'd predict for a self-respecting monster to hide. I know the Wikipedia says that a big sturgeon called Lou is supposed to dwell there, but this is small fry. I'm talking about Minnie, and she's big!