Dang...guess this one's an obscure one, huh?
Sounds interesting.
Hmmm don't think its been made into a film. What was the main characters names? or name of lake? or name of town? I doubt it would be called after the monster but perhaps named after the location. Its a tough one to pin down with out names.
Saying that, you could always bullet point the main plot points and google them. A good chance that it may come up in a search result list.