Lock and Dam No. 22 is a lock and dam located near Saverton, Missouri, on the Upper Mississippi River around river mile 301.2. The movable portion of the dam is 1224 ft long and consists of three roller gates and ten tainter gates. A 1600 ft long submersible earthen dike extends to a flood control levee on the Illinois shore. The main lock is 110 ft wide by 600 ft 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. 22 Historic District, #04000182 covering 1268 acre, 1 building, 5 structures, 4 objects. When the northern part of Mississippi froze in the first week of February 2007, upwards of 20 bald eagles flew down to fish in the churning waters below Lock and Dam No. 22.