Lock and Dam No. 20 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 on the

Upper Mississippi River The Upper Mississippi River is the portion of the Mississippi River upstream of St. Louis, Missouri, United States, at the confluence of its main tributary, the Missouri River. History In terms of geologic and hydrographic history, the Upper ...

, near

Meyer, Illinois Meyer is an unincorporated community in Adams County, Illinois, United States. It has a population of approximately 10 full-time residents as of mid-2009, due to the flood of 2008. The community is part of the Quincy, IL–MO Micropolitan S ...

, and about one mile upstream from Canton, Missouri. The structure is located at

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 ...

343.1. It includes a long dam, 40

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, 3 roller gates, and a lock chamber that is wide by long. 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 ...

as Lock and Dam No. 20 Historic District, #04000180 covering , 1 building, 6 structures, 3 objects.

History

The Lock and Dam are on the site of the former town of Tully, Missouri. Tully was founded in 1834 and became a thriving river port and regional business hub until being virtually destroyed by major flooding in 1851. Left a crumbling "ghost town", what little that remained of Tully was finally removed during Lock and Dam No. 20's construction.

References

External links

* * {{authority control 1935 establishments in Illinois 1935 establishments in Missouri Buildings and structures in Lewis County, Missouri Dams completed in 1935 Dams in Illinois Dams in Missouri Dams on the Mississippi River 20 20 Gravity dams Historic American Engineering Record in Illinois Historic American Engineering Record in Missouri Historic districts on the National Register of Historic Places in Illinois Historic districts on the National Register of Historic Places in Missouri 20 20 Mississippi River locks Mississippi Valley Division National Register of Historic Places in Adams County, Illinois National Register of Historic Places in Lewis County, Missouri Roller dams Transport infrastructure completed in 1935 Transportation buildings and structures in Adams County, Illinois Transportation buildings and structures on the National Register of Historic Places in Missouri United States Army Corps of Engineers dams