Lake Yankton, also called Cottonwood Lake, is an artificial lake that was originally part of the main channel of the Missouri River on the border of the U.S. States of Nebraska and South Dakota, near Yankton, South Dakota. The lake has an approximate surface area of 250 acres and has a maximum depth of 18 feet. The lake is located immediately downstre…Lake Yankton, also called Cottonwood Lake, is an artificial lake that was originally part of the main channel of the Missouri River on the border of the U.S. States of Nebraska and South Dakota, near Yankton, South Dakota. The lake has an approximate surface area of 250 acres and has a maximum depth of 18 feet. The lake is located immediately downstream of Gavins Point Dam and Lewis and Clark Lake, located just north of the current location of the main channel of the Missouri River.
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