Lock and Dam No. 21

Mississippi River Lock and Dam number 21
Location Melrose Township, Adams County, Illinois / Fabius Township, Marion County, Missouri,
near Quincy, Illinois, USA
Coordinates 39°54′21.97″N 91°25′55.87″W / 39.9061028°N 91.4321861°W / 39.9061028; -91.4321861Coordinates: 39°54′21.97″N 91°25′55.87″W / 39.9061028°N 91.4321861°W / 39.9061028; -91.4321861
Construction began 1933
Opening date July 23, 1938
Operator(s) United States Army Corps of Engineers
Dam and spillways
Impounds Upper Mississippi River
Length 1,265 feet (385.6 m) (movable portion)
Reservoir
Creates Pool 21
Total capacity 62,000 acre·ft (0.076 km3)
Catchment area 135,000 sq mi (350,000 km2)
Lock and Dam No. 21 Historic District
Location 0.5 mi. W of IL 57, Quincy, Illinois
Area 107.5 acres (43.5 ha)
Built 1938
MPS Upper Mississippi River 9-Foot Navigation Project MPS
NRHP Reference # 04000181[1]
Added to NRHP March 10, 2004

Lock and Dam No. 21 is a lock and dam located at Quincy, Illinois on the Upper Mississippi River around river mile 324.9. The movable portion of the dam is 1,265 feet (385.6 m) long and consists of three roller gates and ten tainter gates. A 1,400 feet (426.7 m) long submersible dike continues to the Missouri shore. The main lock is 110 feet (33.5 m) wide by 600 feet (182.9 m) long and there is also an incomplete auxiliary lock.[2] In 2004, the facility was listed in the National Register of Historic Places as Lock and Dam No. 21 Historic District, #04000181 covering 1,075 acres (4.4 km2), 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.[3]

Lock and Dam 21. View is from the Illinois side of the river, looking upriver to the north.

See also

References

  1. ↑ National Park Service (2010-07-09). "National Register Information System". National Register of Historic Places. National Park Service.
  2. ↑ "Lock & Dam 21" (PDF). U.S. Army Corps of Engineers. Retrieved January 5, 2014.
  3. ↑ WGEM Archived September 27, 2007, at the Wayback Machine.
Locks and dams of the Upper Mississippi River
Upstream:
Lock and Dam No. 20		 Downstream:
Lock and Dam No. 22


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