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Lock 27 Chain of Rocks Canal

3291 West 20th Street, Granite City IL 62040 | 618-452-7107
Southernmost Illinois

The southernmost lock & dam on the Mississippi River, and the only one south of the confluence of the Mississippi and Missouri rivers, Lock & Dam 27 moves more cargo than any other lock and dam on the Mississippi. It was built in response to a "chain of rocks" that made the river unnavigable in low water. The lock and dam are unique on the Mississippi, because the dam is a rock weir and the lock isn't connected to the dam and is actually 3 miles away at the southern end of the Chain of Rocks Canal which allows traffic to bypass the unnavigable portion.


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