Lock and Dam No. 25 is a lock and dam located near Winfield, Missouri, on the Upper Mississippi River around river mile 241.4. The movable portion of the dam is 1296 ft long and consists of three roller gates and 14 tainter gates. A 2566 ft submersible dike extends to the Illinois shore. A 5 mi long dike is part of the facility extending upstream on the Missouri side of the river. The main lock is 110 ft wide by 600 ft long. In 2004, the facility was listed in the National Register of Historic Places as Lock and Dam No. 25 Historic District, #04000184 covering 3164 acre, 2 buildings, 7 structures, 2 objects.