Lock and Dam No. 20

Lock and Dam No. 20 is a lock and dam located on the Upper Mississippi River, near Meyer, Illinois, and about one mile upstream from Canton, Missouri.

Mississippi River Lock and Dam number 20
CountryUnited States
LocationLima Township, Adams County, Illinois / Canton Township, Lewis County, Missouri, near Meyer, Illinois and Canton, Missouri
Coordinates40°8′39″N 91°30′36″W[1]
Construction began1932 (1932)
Opening dateNovember 20, 1935 (1935-11-20)
Construction costUS$4.45 million
Operator(s) U.S. Army Corps of Engineers, Rock Island District
Dam and spillways
ImpoundsUpper Mississippi River
Length2,369 feet (722 m)
Reservoir
CreatesPool 20
Total capacity58,000 acre⋅ft (0.072 km3)
Catchment area134,300 sq mi (348,000 km2)
Lock and Dam No. 20 Historic District
Lock and Dam No. 20 is located in Missouri
Lock and Dam No. 20
Lock and Dam No. 20 is located in the United States
Lock and Dam No. 20
Location1⁄2 mi (800 m) N of Henderson St, Canton, Missouri
Area83.9 acres (34.0 ha)
Built1935
ArchitectUS Army Corps of Engineers; Abbott, Edwin E.
MPSUpper Mississippi River 9-Foot Navigation Project MPS
NRHP reference No.04000180[2]
Added to NRHPMarch 10, 2004

The structure is located at river mile 343.1. It includes a 2,369 feet (722 m) long dam, 40 tainter gates, 3 roller gates, and a lock chamber that is 110 feet (34 m) wide by 600 feet (183 m) long. There is also an incomplete auxiliary lock. In 2004, the facility was listed in the National Register of Historic Places as Lock and Dam No. 20 Historic District, #04000180 covering 839 acres (340 ha), 1 building, 6 structures, 3 objects.

Lock and Dam number 20. View is downriver to the south.
[3]

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.[4] Left a crumbling "ghost town", what little that remained of Tully was finally removed during Lock and Dam No. 20's construction.[5]

References
  1. "Lock and Dam 20". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. 15 January 1980.
  2. "National Register Information System – (#04000180)". National Register of Historic Places. National Park Service. March 13, 2009.
  3. "Upper Mississippi River Locks & Dams" (PDF). U.S. Army Corps of Engineers. 2016. Archived from the original (PDF) on 26 December 2016. Retrieved 14 July 2021.
  4. "A Directory of Towns, Villages, and Hamlets Past and Present of Lewis County, Missouri". Springfield-Greene County Public Library. 2013. Retrieved 21 July 2013.
  5. "Canton Historic Marker". Missouri Historical Society text via Waymarking.com. 2013 [1957]. Retrieved 23 July 2013.
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