West Lake Okoboji (Arnolds Park / Pillsbury Point)

West Lake Okoboji is a 3,800+ acre glacial lake and the clearest, deepest natural lake in Iowa, with visibility ranging from about 12 ft in summer to 40-70 ft in winter and early spring. Popular dives include three submerged pipelines (Pillsbury Point, the Milford Tower and The Inn), a truck that fell through the ice in the 1940s in Smith's Bay, scattered boat remains, and rocky points with drop-offs. Most aquatic life is seen between 10 and 40 ft, though the lake bottoms out around 136 ft.