The waters of Flathead Lake in Montana are so clear that on calm days boats appear to float above the water. It is known to be on of the clearest fresh water
Flathead Lake: Go Island-Hopping in Montana's Stunning Islands - Thrillist
What's to blame for too little water in Flathead Lake: climate or mismanagement?
The Clearest Lake In Montana is Flathead Lake
Flathead Lake Dubbed Having Clearest Water in the World - Montana Hunting and Fishing Information