Lock and Dam No. 21 is a

lock Lock(s) may refer to: Common meanings *Lock and key, a mechanical device used to secure items of importance *Lock (water navigation), a device for boats to transit between different levels of water, as in a canal Arts and entertainment * ''Lock ...

and

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 ...

located at

Quincy, Illinois Quincy ( ), known as Illinois's "Gem City", is a city in and the county seat of Adams County, Illinois, United States, located on the Mississippi River. The 2020 census counted a population of 39,463 in the city itself, down from 40,633 in 2010. ...

on the Upper

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 ...

around

river mile A river mile is a measure of distance in miles along a river from its mouth. River mile numbers begin at zero and increase further upstream. The corresponding metric unit using kilometers is the river kilometer. They are analogous to vehicle roa ...

324.9. The movable portion of the dam is long and consists of three roller gates and ten

tainter gate The Tainter gate is a type of radial arm floodgate used in dams and canal locks to control water flow. It is named for Wisconsin structural engineer Jeremiah Burnham Tainter. A side view of a Tainter gate resembles a slice of pie with the ...

s. A long submersible dike continues to the

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 ...

shore. The main lock is wide by long and there is also an incomplete auxiliary lock. In 2004, the facility was listed in the

National Register of Historic Places The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic v ...

as Lock and Dam No. 21 Historic District, #04000181 covering , 1 building, 4 structures, 4 objects. Currently there is a study being conducted by the city of Quincy to convert Lock & Dam No. 21, 20, and 22 into being hydroelectric by 2016.WGEM

References

External links

*
Lock and Dam No. 21 - U.S. Army Corps of Engineers
Dams completed in 1938 Transportation buildings and structures in Adams County, Illinois Buildings and structures in Marion County, Missouri Dams in Missouri Dams in Illinois 21 Mississippi River locks National Register of Historic Places in Adams County, Illinois United States Army Corps of Engineers dams Transport infrastructure completed in 1938 Historic American Engineering Record in Illinois Historic American Engineering Record in Missouri Roller dams Gravity dams Dams on the Mississippi River 21 21 Mississippi Valley Division Historic districts on the National Register of Historic Places in Illinois Buildings and structures in Quincy, Illinois 21 1938 establishments in Illinois 1938 establishments in Missouri {{AdamsCountyIL-NRHP-stub

See also

References

External links