Fort Bennett, Military fort in Stanley County, South Dakota.
Fort Bennett was a military post built at the junction of the Cheyenne River and the Missouri River, featuring barracks, officer residences, and storage structures made from cottonwood logs. The compound included a hospital, guard houses, and administrative buildings spread across the site.
The post was established in 1870 to serve as a control center for Sioux tribes in the region. It was renamed in 1878 to honor Captain Andrew Bennett, who had died in conflict with Bannock Indians, and closed in 1891.
The fort managed resources and administration for Minneconjou, Sans Arc, and Two Kettle tribes, supporting between 1,500 and 7,000 Native American residents.
The site now lies submerged beneath Lake Oahe, created when the Oahe Dam was built in the early 1960s. Visitors cannot see physical remains on the ground because the entire location is underwater.
The site originally bore the name Post at Cheyenne River Agency before its renaming in 1878. This detail reveals how the location's designation reflected its administrative purpose at that time.
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