Clean lakes in America are Flathead Lake in Montana and Lake Travis in Texas, according to Roadtrippers.com and USA Today. Another clean lake in America is the Crater Lake in Oregon.
Crater Lake is possibly the cleanest lake in the world because it is fed solely by snow and rain rather than any rivers or oceans. Because of its clarity, the color of the water is a vibrant deep blue. Flathead Lake also offers stunning clarity, where the bottom surface of the lake is clearly visible throughout most of its 191.5 square miles. Flathead is colloquially referred to as having "OCD levels" of cleanliness.
Lake Travis was ranked as the sixth-cleanest lake in the United States by the Austin City Guide. The lake is a very popular location for scuba divers due to both its clarity and massive size.