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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 (100 ha) and has a maximum depth of 18 feet (5.5 m). The lake is located immediately downstream (east) of Gavins Point Dam and Lewis and Clark Lake, located just north of the current location of the main channel of the Missouri River.
Originally the area now known as Lake Yankton was part of the main channel of the Missouri River. During the construction of Gavins Point Dam (1952-1957), the U.S. Army Corps of Engineers redirected the main channel of the Missouri south to its current location, just south of the Training Dike. The state line between Nebraska and South Dakota is located the mid-point of the original historical (at Nebraska Statehood) main channel. Therefore the lake is located in both Cedar County, Nebraska and Yankton County, South Dakota, even though it is widely incorrectly assumed that the lake is located entirely in South Dakota. Most of the northern and eastern portions of the lake and shoreline are in South Dakota, and most of the southern and western portions of the lake and shoreline are in Nebraska.
After dam construction completion a dike, called the Training Dike, was constructed by the Corps to "train" the river to its current location and flow, thus creating a land barrier separating Lake Yankton from the Missouri River. The lake was then impounded in order to control the lake level for fish and wildlife enhancement, along with recreational opportunities. The outlet from the lake known locally as "The Bubble" is a popular fishing spot, where the lake flows into the Missouri River. The lake is a public water managed by the U.S. Army Corps of Engineers, and fisheries are managed jointly between the Nebraska Game and Parks Commission and the South Dakota Department of Game, Fish, and Parks.
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26 авг 2024
