Lewis and Clark Lake is a 31,400 acre (130 km²) reservoir located on the border of the U.S. states of Nebraska and South Dakota on the Missouri River. The lake is approximately in length with over of shoreline and a maximum water depth of . The lake is impounded by Gavins Point Dam and is managed by the U.S. Army Corps of Engineers, Omaha District. History The Missouri River Valley Area is abound with history involving several early Native American Tribes, Pioneers, and other settlers to the area due to ease of river transportation and abundant resources. Lewis and Clark Lake is named after explorers Meriwether Lewis and William Clark of the Lewis and Clark Expedition. The lake is located along the Lewis and Clark National Historic Trail. The archaeological record in the area dates back to the Archaic Period, sometime around 3,000 to 5,000 B.C. The Archaic Period people lived along small tributary streams that flow into the Missouri Valley. Later, Woodland Period people (500 B.C. – 1,000 A.D.) lived in the area. More recent inhabitants include the Ponca, Yankton Sioux and Omaha tribes in the late 18th and 19th centuries. The Minnesota Santee Sioux arrived on the river shore in the mid-1800s and remain in the area. In 1804, while traveling up the Missouri River on their epic journey to the Pacific Ocean, Lewis and Clark participated in a Grand council with the Yankton Sioux at a site below Calumet Bluff. This significant meeting was the first meeting with a Sioux tribe on their journey upstream. In 1874, the Bon Homme Colony of Hutterites, a branch of the Mennonite movement exiled from Austria, settled on what is now the north shore of Lewis and Clark Lake. They are the first Hutterite Colony in South Dakota and the United States. The colony maintains a traditional communal way of life. The lake was filled in 1957 with the completion of construction of Gavins Point Dam across the river valley. Location The lake is an impoundment of the Missouri River, located approximately upstream of St. Louis, Missouri where the Missouri River joins the Mississippi River. The lake is located within Cedar and Knox Counties in Nebraska and Bon Homme and Yankton Counties in South Dakota. Lake Yankton is located immediately downstream of Gavins Point Dam. The Santee Sioux Reservation is located along the southwestern shore in Knox County. The lake is