It is number on the list of the cleanest lakes not only in the U.S., but also the whole world. You can see the bottom of over 70% of the lake.
The water in Crater Lake is incredibly clean and clear. It is so clear that the bottom of the lake can be seen from the surface.
The water of the lake looks crystal clear, and the scenery is thoroughly stunning. It’s no wonder many people come here to enjoy the outdoors.
The water in Flathead Lake is very clean. Several rivers are fed by this lake, including the Flathead River, one of the cleanest rivers in the United States.