Near Fort Pierre in Stanley County, South Dakota — The American Midwest (Upper Plains)
The structure can release 748,000 gallons of water per second (110,000 CFS).
The intakes cannot be seen, they are under 160 feet of water in Lake Oahe.
The 19 foot diameter, ¾ mile long tunnels are flushed and inspected yearly.
Ballards are concrete structures used to slow water, they can also creat dangers for swimmers and boaters.
Erected by US Army Corps of Engineers.
Topics. This historical marker is listed in these topic lists: Industry & Commerce • Waterways & Vessels. A significant historical year for this entry is 1958.
Location. 44° 26.382′ N, 100° 24.637′ W. Marker is near Fort Pierre, South Dakota, in Stanley County. Marker is on Power House Road. The stilling basin is located on the south side of the Oahe Dam off the Power House Road. Touch for map. Marker is in this post office area: Fort Pierre SD 57532, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers are within 3 miles of this marker, measured as the crow flies. Centre of Missouri Valley History (approx. half a The Lewis and Clark Expedition (approx. 1.7 miles away); A Changing Landscape (approx. 1.7 miles away); The Oahe Dam & Lake (approx. 1.8 miles away); Oahe Mission (approx. 1.8 miles away); Oahe Mission School and Chapel (approx. 1.8 miles away); Turtle Effigy (approx. 2.3 miles away); Sioux Indian Mosaic (approx. 2.3 miles away).
Credits. This page was last revised on April 9, 2021. It was originally submitted on April 8, 2021, by Ruth VanSteenwyk of Aberdeen, South Dakota. This page has been viewed 40 times since then. Photos: 1, 2. submitted on April 8, 2021, by Ruth VanSteenwyk of Aberdeen, South Dakota. • Mark Hilton was the editor who published this page.