Environmental groups are calling on Congress to reform the Army Corps of Engineers in the wake of a Pentagon report confirming the Corps doctored numbers in a feasibility study of expanded locks on the Mississippi River. Critics say the Corps of Engineers is too quick to back massive engineering projects. But farm groups say they NEED bigger locks on the Mississippi to reduce their shipping costs. Minnesota Public Radio's Stephanie Hemphill reports. For more information about the controversy over expansion of locks and dams on the Mississippi go to minnesotapublicradio.org to see our series called "Changing Course: The Future of the Mississippi." {