has a maximum depth of 370.7 ft (113.0 m), and an
average of 164.7 ft (50.2 m). This makes Flathead lake deeper than
the average depths of the Yellow Sea or the Persian Gulf. Polson Bay, at the
lake's outlet was raised 10 ft (3.0 m) by Kerr Dam. It is one of the
cleanest in the populated world for its size and type
