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Lock and Dam No. 5A is a lock and dam located near Fountain City, Wisconsin and Goodview, Minnesota on the Upper Mississippi River around river mile 728.5.
It was constructed in 1932, placed in operation in 1936. Its last major rehabilitation was from 1989 through 2000.
The dam consists of a concrete structure 682 feet (207.9 m) long with five roller gates and five tainter gates with an earth embankment 22,000 feet (6,705.6 m) long. Its concrete overflow spillway is 1,000 feet (304.8 m) long and its lock is 110 feet (33.5 m) wide by 600 feet (182.9 m) long.
The lock and dam are owned and operated by the St. Paul District of the United States Army Corps of Engineers-Mississippi Valley Division.
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