Fort Randall Dam is a

earthen Soil, also commonly referred to as earth or dirt, is a mixture of organic matter, minerals, gases, liquids, and organisms that together support life. Some scientific definitions distinguish ''dirt'' from ''soil'' by restricting the former term ...

dam A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use ...

which spans the Missouri River and impounds

Lake Francis Case Lake Francis Case is a large reservoir impounded by Fort Randall Dam on the Missouri River in south-central South Dakota, United States. The lake has an area of and a maximum depth of . Lake Francis Case has a length of approximately and has a ...

, the 11th-largest

reservoir A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including contro ...

in the U.S. The dam joins Gregory and Charles Mix counties,

South Dakota South Dakota (; Sioux language, Sioux: , ) is a U.S. state in the West North Central states, North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Lakota people, Lakota and Dakota peo ...

a distance of 880 river miles (1,416 km) upstream of

St. Louis St. Louis () is the second-largest city in Missouri, United States. It sits near the confluence of the Mississippi and the Missouri Rivers. In 2020, the city proper had a population of 301,578, while the bi-state metropolitan area, which e ...

Missouri Missouri is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it is bordered by eight states (tied for the most with Tennessee ...

, where the river joins the

Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it f ...

. The dam and

hydroelectric power Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined and ...

plant were constructed by and are currently operated by the

U.S. Army Corps of Engineers , colors = , anniversaries = 16 June (Organization Day) , battles = , battles_label = Wars , website = , commander1 = ...

History & background

Fort Randall Dam was authorized by the

Flood Control Act of 1944 The Pick-Sloan Flood Control Act of 1944 (P.L. 78–534), enacted in the 2nd session of the 78th Congress, is U.S. legislation that authorized the construction of numerous dams and modifications to previously existing dams, as well as levees acros ...

and plays a key role in the Pick–Sloan Plan for development of water resources in the Missouri River basin. The U.S. Army Corps of Engineers began construction of the dam in 1946, and was the first Pick-Sloan dam completed by the

Omaha Omaha ( ) is the largest city in the U.S. state of Nebraska and the county seat of Douglas County. Omaha is in the Midwestern United States on the Missouri River, about north of the mouth of the Platte River. The nation's 39th-largest city ...

District. President

Dwight D. Eisenhower Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; ; October 14, 1890 – March 28, 1969) was an American military officer and statesman who served as the 34th president of the United States from 1953 to 1961. During World War II, ...

threw the switch that started the first power generating unit in 1954. When completed in 1956, Fort Randall Dam and the

Project cost approximately $200 million.

U.S. Route 18 U.S. Route 18 (US 18) is an east–west U.S. highway in the Midwestern United States. The western terminus is in Orin, Wyoming at an interchange with Interstate 25. Its eastern terminus is in downtown Milwaukee, Wisconsin. However, US 18 run ...

and

U.S. Route 281 U.S. Route 281 (US 281) is a north–south United States Numbered Highway. At it is the longest continuous three-digit U.S. Route. The highway's northern terminus is at the International Peace Garden, north of Dunseith, North Dakota, at t ...

cross the crest of the dam. The dam is just over north of the

Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwe ...

state line. The Fort Randall Dam is located within sight of its namesake

Fort Randall The Fort Randall Military Post was established in 1856 to help keep peace on the frontier. It was located on the south side of the Missouri River in South Dakota, just below the present site of the Fort Randall Dam. History The site for the f ...

, an early

U.S. Army The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...

Frontier Post. Fort Randall Dam is one of six Missouri River mainstem dams, the next dam upstream is

Big Bend Dam Big Bend Dam is a major embankment rolled-earth dam on the Missouri River in Central South Dakota, United States, creating Lake Sharpe. The dam was constructed by the U.S. Army Corps of Engineers as part of the Pick-Sloan Plan for Missouri w ...

, near Ft. Thompson and the next dam downstream is

Gavins Point Dam Gavins Point Dam is a long embankment rolled-earth and chalk-fill dam which spans the Missouri River and impounds Lewis and Clark Lake. The dam joins Cedar County, Nebraska with Yankton County, South Dakota a distance of 811.1 river miles (1,305 ...

, near Yankton.

Hydroelectric Power

The eight generating units of the Fort Randall Dam are capable of generating 40

megawatts The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantify the rate of energy transfer. The watt is named after James Watt ...

of electricity each, with an annual production of 1.727 billion

kilowatt-hour A kilowatt-hour (unit symbol: kW⋅h or kW h; commonly written as kWh) is a unit of energy: one kilowatt of power for one hour. In terms of SI derived units with special names, it equals 3.6 megajoules (MJ). Kilowatt-hours are a common bil ...

s. The combined maximum capacity of 320 megawatts is enough to supply 245,000 households, according to the Corps of Engineers. The river behind the dam drains an area of . Its reservoir,

, has a surface area of at maximum operating pool, coinciding with a volume of .

2011 Missouri River flood

In June 2011, in response to the

2011 Missouri River Floods The 2011 Missouri River floods was a flooding event on the Missouri River in the United States.The flooding was triggered by record snowfall in Rocky Mountains of Montana and Wyoming along with near-record spring rainfall in central and easter ...

, the dam was releasing over , which greatly exceeded its previous record release of set in 1997.

Visitor Center

The Fort Randall Visitor Center is located on the western edge of

Pickstown, South Dakota Pickstown is a town in southern Charles Mix County, South Dakota, United States. The population was 230 at the 2020 census. It was named after U.S. Army General Lewis A. Pick, former director of the Missouri River Office of the United States A ...

along U.S. Highway 281 and 18. Open from Memorial Day through Labor Day, the visitor center offers a view of Fort Randall Dam, Lake Francis Case and the Missouri River. Exhibits highlight the dam's construction, area natural and cultural history and paleontology. There is also a freshwater aquarium with fish species found in the Missouri River.

References

External links

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Fort Randall Dam & Lake Francis Case
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