Gateways to Commerce: The U.S. Army Corps of Engineers' 9-Foot Channel Project on the Upper Mississippi River (Chapter 7)
Roller dam - Wikipedia
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Gateways to Commerce: The U.S. Army Corps of Engineers' 9-Foot Channel Project on the Upper Mississippi River (Chapter 7)
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Roller dam - Wikipedia
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Chiques Roller Mill Dam Removal – Business for Water Stewardship
Roller Dam across the Mississippi River between Davenport, Iowa and Rock Island, Ill.
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Grand Valley Diversion Dam - Wikipedia
Roller dam - Wikipedia
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