Lock and Dam No. 5 is a lock and dam located between Buffalo County, Wisconsin and Winona County, Minnesota on the Upper Mississippi River around river mile 738.1. It was constructed and placed in operation May 1935. The site underwent major rehabilitation from 1987 through 1998. The dam consists of concrete structure 1,619 feet (493.5 m) long with six roller gates and 28 tainter gates and an earth embankment 18,000 feet (5,486.4 m) long.