The U.S. Army Corps of Engineers provides some preventive maintenance on the Mississippi River in the form of mat sinking to help protect levees and other river structures used to help keep the waterway navigable and reduce the risk of flooding for residents of Louisiana, Jan. 4, 2013. It’s an well-orchestrated process using one of the corps’ original mat-laying machines. In this video they crew is “mat sinking” at Carrollton Bend, New Orleans. (Video by G. A. Volb/USACE). -teamneworleans on YouTube.