| Lock and Dam No. 21 | |
|---|---|
Mississippi River Lock and Dam number 21
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| 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; -91.4321861 |
| Construction began | 1933 |
| Opening date | July 23, 1938 |
| Operator(s) |  U.S. Army Corps of Engineers, Rock Island District |
| 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 | |
 
 Show map of the United States | |
| Location | 0.5 mi. W of IL 57, Quincy, Illinois |
| Area | 107.5 acres (43.5 ha) |
| Built | 1938 |
| Architect | US Army Corps of Engineers; Abbott, Edwin E., et al. |
| MPS | Upper Mississippi River 9-Foot Navigation Project MPS |
| NRHP reference No. | 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]
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Media related to Mississippi River Lock and Dam number 21 at Wikimedia Commons
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