East Okoboji Lake is a natural body of water, approximately 1,835 acre

Acre

The acre is a unit of area in a number of different systems, including the imperial and U.S. customary systems. The most commonly used acres today are the international acre and, in the United States, the survey acre. The most common use of the acre is to measure tracts of land.The acre is related...

s (7.43 km²) in area, in Dickinson County

Dickinson County, Iowa

-2010 census:The 2010 census recorded a population of 16,667 in the county, with a population density of . There were 12,849 housing units, of which 7,554 were occupied.-2000 census:...

 in northwest Iowa

Iowa

Iowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. It is part of the chain of lakes known as the Iowa Great Lakes

Iowa Great Lakes

The Iowa Great Lakes are a group of natural glacial lakes in Dickinson County in northwestern Iowa in the United States. The three principal lakes of the group are Spirit Lake, West Okoboji Lake, and East Okoboji Lake. They are the largest natural lakes in the state of Iowa. The largest, Spirit...

. The area was long inhabited by the Santee or Eastern Dakota Sioux

Sioux

The Sioux are Native American and First Nations people in North America. The term can refer to any ethnic group within the Great Sioux Nation or any of the nation's many language dialects...

. The lake was known after its Dakota

Dakota language

Dakota is a Siouan language spoken by the Dakota people of the Sioux tribes. Dakota is closely related to and mutually intelligible with the Lakota language.-Dialects:...

-language name, Okoboozhy, meaning reeds and rushes.

History

The towns of Spirit Lake

Spirit Lake, Iowa

Spirit Lake is a city in Dickinson County, Iowa, United States. The population was 4,261 at the 2000 census. It is the county seat of Dickinson County.The town is located along the western shore of East Okoboji Lake, in the Iowa Great Lakes region....

 and Okoboji

Okoboji, Iowa

Okoboji is a city in Dickinson County, Iowa, United States, along the eastern shore of West Okoboji Lake in the Iowa Great Lakes region. The population was 820 at the 2000 census. Pikes Point State Park is located within the city limits...

, founded as European-American settlements in the nineteenth century, sit along its western shore. They became notable after the Spirit Lake Massacre

Spirit Lake Massacre

The Spirit Lake Massacre was an attack by a Wahpetuke band of Santee Sioux on scattered Iowa frontier settlements during a severe winter. Suffering a shortage of food, the renegade chief Inkpaduta led 14 Sioux against the settlements near Okoboji and Spirit lakes in the northwestern territory of...

 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

Ice age

An ice age or, more precisely, glacial age, is a generic geological period of long-term reduction in the temperature of the Earth's surface and atmosphere, resulting in the presence or expansion of continental ice sheets, polar ice sheets and alpine glaciers...

 approximately 13,000 years ago.

The lake is shallow, with an average depth of 10 ft (3 m) and a maximum depth of 22 ft (7 m). During the summer months, it is prone to stratification

Lake stratification

Lake stratification is the separation of lakes into three layers:# Epilimnion - top of the lake.# Metalimnion - middle layer that may change depth throughout the day.# Hypolimnion - the bottom layer....

 and to overgrowth with algae

Algae

Algae are a large and diverse group of simple, typically autotrophic organisms, ranging from unicellular to multicellular forms, such as the giant kelps that grow to 65 meters in length. They are photosynthetic like plants, and "simple" because their tissues are not organized into the many...

.

Fishing

The lake is a popular fishing destination in the region, especially for bullhead

Bullhead catfish

Ameiurus is a genus of catfishes in the family Ictaluridae. It contains the three common types of bullhead catfish found in waters of the United States, the black bullhead , the brown bullhead , and the yellow bullhead , as well as other species, such as the white catfish Ameiurus is a genus of...

s.

External links

• Iowa Great Lakes Region
• Iowa Department of Natural Resources site on East Okoboji Lake
• University of Iowa site on East Okoboji Lake chemistry