East Okoboji Lake is a natural body of water, approximately 1,835 acres (7.43 km²) 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.

Quick Facts Location, Coordinates ...

East Okoboji Lake
(1903)
East Okoboji Lake Show map of Iowa East Okoboji Lake Show map of the United States
Location	Dickinson County, Iowa
Coordinates	43°24′17″N 095°04′31″W
Basin countries	United States
Surface area	1,835 acres (743 ha)
Average depth	10 ft (3.0 m)
Max. depth	22 ft (6.7 m)
Surface elevation	1,398 ft (426 m) [1]
Settlements	Spirit Lake, Okoboji

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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.

Geologically, the lake, like its neighbors, is a glacial pothole, a remnant of the most recent ice age approximately 13,000 years ago.^{[citation needed]}

The lake is shallow, with an average depth of 10 ft (3.0 m) and a maximum depth of 22 ft (6.7 m). During the summer months, it is prone to stratification and to overgrowth with algae.^{[citation needed]}

The lake is a popular fishing destination in the region, for both open water and ice fishing. East and West Lake Okoboji have a healthy population of numerous species including: Black Crappie, Bluegill, Channel Catfish, Largemouth Bass, Muskie, Northern Pike, Smallmouth Bass, Walleye, White Bass, Yellow Bass, Yellow Bullhead, and Yellow Perch.^{[2][full citation needed]}

The lake was the main setting of the fourth X-Files episode, "Conduit". However, the episode was filmed in British Columbia, with Buntzen Lake being used as Lake Okobogee.

• Big Spirit Lake
• West Okoboji Lake