Near Fort Pierre in Stanley County, South Dakota — The American Midwest (Upper Plains)

Stilling Basin

Photographed by Ruth VanSteenwyk, April 2, 2021

1. Stilling Basin Marker

Inscription. Completed in 1958, the Stilling Basin allowed the river to flow through Oahe Dam until the Powerhouse became operation in 1962.

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. It 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.

Regionally, this marker is in East River.

It is also in the American Lewis & Clark Corridor,

on the prairies,

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and on the Northern Plains.

Globally, it is in North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Historically, it finds itself in what was once Rupert’s Land

and also the Louisiana Purchase.

Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies: Centre of Missouri Valley History (approx. half a mile away); Archeology in Oahe Downstream (approx. 0.9 miles away); The Arikara / The Sioux (approx. 0.9 miles away); Steamboats (approx. 0.9 miles away); Honored Guests / Momentarily Adrift (approx. 1.1 miles away); The Lewis & Clark Expedition (approx. 1.7 miles away); A Tense Three Days (approx. 1.7 miles away); The Lewis and Clark Expedition (approx. 1.7 miles away). Touch for a list and map of all markers in Fort Pierre.

Photographed by Ruth VanSteenwyk, April 2, 2021

2. Stilling Basin Marker

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 672 times since then and 41 times this year. Photos: 1, 2. submitted on April 8, 2021, by Ruth VanSteenwyk of Aberdeen, South Dakota. • Mark Hilton was the editor who published this page.