Lock and Dam No. 20


Lock and Dam No. 20 is a lock and dam located on the Upper Mississippi River, about one mile upstream from Canton, Missouri.
The structure is located at river mile 343.1. It includes a long dam, 40 tainter gates, 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 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.