Lock and Dam No. 9 is an American lock and dam located near Lynxville, Wisconsin and Harpers Ferry, Iowa on the Upper Mississippi River around river mile 647.9. The lower portion of Pool 9 was formally named Lake Winneshiek. The normal pool elevation behind the dam is 620 ft. It was constructed and placed in operation in July 1937. The site underwent a major rehabilitation from 1989 and 2006. The dam consists of concrete structure 811 ft long with five roller gates and eight tainter gates. Earth embankment 9800 ft long with a grouted overflow spillway 1350 ft long. The lock is 110 ft wide by 600 ft long. Lock and Dam No. 9 is located 12 miles upstream from Prairie du Chien, Wisconsin. 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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