Lock and Dam No. 15 is a lock and dam located on the Upper Mississippi River. It spans the river between Rock Island Illinois and Davenport Iowa. Lock and Dam 15 is the largest roller dam in the world its dam is 1203 feet (366.7 m) long and consists of nine 109 feet (33.2 m) non-submersible non-overflow roller gates and two 109 feet (33.2 m) non-submersible overflow roller gates.
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