East Okoboji Lake
East Okoboji Lake is a natural body of water, approximately in area, in Dickinson County in northwest Iowa in the United States. It is part of the chain of lakes known as the Iowa Great Lakes. The area was long inhabited by the Santee or Eastern Dakota Sioux. The lake was known after its Dakota-language name, Okoboozhy, meaning reeds and rushes.
History
The towns of Spirit Lake and Okoboji, founded as European-American settlements in the nineteenth century, sit along its western shore. They became notable after the Spirit Lake Massacre of 1857, when a renegade band of Sioux attacked the frontier settlements, in part for food, because they were suffering starvation during a severe winter with heavy snows. It was the last Native American attack in Iowa against settlers.Geology
Geologically, the lake, like its neighbors, is a glacial pothole, a remnant of the most recent ice age approximately 13,000 years ago.The lake is shallow, with an average depth of and a maximum depth of. During the summer months, it is prone to stratification and to overgrowth with algae.