Lock and Dam No. 9 is a 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 . 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 long with five roller gates and eight tainter gates. Earth embankment long with a grouted overflow spillway long. The lock is wide by long. Lock and Dam No. 9 is located 12 miles upstream from Prairie du Chien, Wisconsin.
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Lock and Dam No. 9
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