Dredge Thompson makes its final voyage on the Mississippi River
The U.S. Army Corps of Engineers Dredge William A. Thompson makes its way down the Upper Mississippi River for the last time June 12, 2012. After more than 80 years of service with the Corps of Engineers, the Thompson will retire in Prairie du Chien, Wis.

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Photo by: Shannon L. Bauer |  VIRIN: 120612-A-CE999-002.JPG