Image:UMRS Lock 12.jpg
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Barges at Upper Mississippi River System (UMRS) Lock and Dam 12 at Bellevue, IA. The lock is 110 feet wide by 600 feet long; completed in 1938.
This work is in the public domain because it is a work of the United States Federal Government. This applies worldwide. See Copyright.
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From the U.S. Army Corps of Engineers website - Navigation Locks and Dams - Inland Waterway System (http://www.mvr.usace.army.mil/navdata/l&dphoto.htm)
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