Encounter Atlas
Flathead Lake is the largest natural freshwater lake west of the Mississippi by surface area. In 1889 passengers on the steamboat U.S. Grant reported a whale-like animal, and more than 100 sightings have followed.
Most describe a dark, eel-like creature 20 to 40 ft long. Some suspect a giant sturgeon; a 7-ft white sturgeon was caught in the lake in 1955.
What witnesses report
- Dark, eel-like body
- Large wakes on calm water
Famous cases
- 1889U.S. Grant steamboat sighting
Flathead Lake, Montana
Seen the Flathead Lake Monster?
Tell us what happened. Every report is read by a person before it goes on the map, and you can stay anonymous.
Report a Flathead Lake Monster encounter Not sure what it was?
