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Visitors Guide to Lock and Dam No. 22 is located near Quincy,
Illinois the Upper Mississippi River around river mile 324.9. Listed on
the National Register of Historic Places construction of the lock and dam
began in 1933 and became operational in July 1938. The dam portion of the
structure is 1,265 feet long and consists of 3 roller gates and 10 tainter
gates. A 1,400-foot long submersible earthen dike extends to a flood
control levee on the Missouri shore. The main lock is 110 feet wide by 600
feet long and there is also an incomplete auxiliary lock. Many endangered
bald eagles establish their winter home in the trees along Lock and Dam 21.
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