Fort Randall Dam is a

earthen An earth structure is a building or other structure made largely from soil. Since soil is a widely available material, it has been used in construction since prehistory. It may be combined with other materials, compressed and/or baked to add ...

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, aqua ...

which spans the

Missouri River The Missouri River is a river in the Central United States, Central and Mountain states, Mountain West regions of the United States. The nation's longest, it rises in the eastern Centennial Mountains of the Bitterroot Range of the Rocky Moun ...

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 (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation. Reservoirs are created by controlling a watercourse that drains an existing body of wa ...

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

South Dakota South Dakota (; Sioux language, Sioux: , ) is a U.S. state, 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 Dakota people, Dakota Sioux ...

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

St. Louis St. Louis ( , sometimes referred to as St. Louis City, Saint Louis or STL) is an independent city in the U.S. state of Missouri. It lies near the confluence of the Mississippi and the Missouri rivers. In 2020, the city proper had a populatio ...

Missouri Missouri (''see #Etymology and pronunciation, pronunciation'') 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 border ...

, where the river joins the

Mississippi River The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Ita ...

. The dam and

hydroelectric power Hydroelectricity, or hydroelectric power, is Electricity generation, electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other Renewable energ ...

plant were constructed by and are currently operated by the

U.S. Army Corps of Engineers The United States Army Corps of Engineers (USACE) is the military engineering branch of the United States Army. A direct reporting unit (DRU), it has three primary mission areas: Engineer Regiment, military construction, and civil wor ...

History and 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 ac ...

and plays a key role in the Pick–Sloan Plan for development of water resources in the

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 List of cities in Nebraska, most populous city in the U.S. state of Nebraska. It is located in the Midwestern United States along the Missouri River, about north of the mouth of the Platte River. The nation's List of United S ...

District. President

Dwight D. Eisenhower Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; October 14, 1890 – March 28, 1969) was the 34th president of the United States, serving from 1953 to 1961. During World War II, he was Supreme Commander of the Allied Expeditionar ...

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 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, a ...

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

Nebraska Nebraska ( ) is a landlocked U.S. state, state in the Midwestern United States, Midwestern region of the United States. It borders South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Ka ...

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 ...

, an early

U.S. Army The United States Army (USA) is the primary land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of the United Stat ...

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, near Yankton. A significant birding site, the Fort Randall Eagle Roost, is located near the dam. The Eagle Roost was listed as a

National Natural Landmark The National Natural Landmarks (NNL) Program recognizes and encourages the conservation of outstanding examples of the natural history of the United States. It is the only national natural areas program that identifies and recognizes the best e ...

in 1967, shortly after completion of the dam. The eagles that roost here may use the dam's spillway to catch and eat fish.

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 in honor o ...

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 non-SI unit of energy equal to 3.6 megajoules (MJ) in SI units, which is the energy delivered by one kilowatt of power for one hour. Kilowatt-hours are a comm ...

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 flooding event on the Missouri River in the United States was triggered by record snowfall in Rocky Mountains of Montana and Wyoming along with near-record spring rainfall in central and eastern Montana. All six major dams along the ...

, 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 ...

, along U.S. Highway 281 and 18. Open from

Memorial Day Memorial Day (originally known as Decoration Day) is a federal holiday in the United States for mourning the U.S. military personnel who died while serving in the United States Armed Forces. It is observed on the last Monday of May. It i ...

through

Labor Day Labor Day is a Federal holidays in the United States, federal holiday in the United States celebrated on the first Monday of September to honor and recognize the Labor history of the United States, American labor movement and the works and con ...

, the visitor center offers a view of the 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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