Yup, thats dredging, good old EPA, makes you do backflips to get the mud out, like on the Mac Bridge, they have to capture every flake of paint or they are fined, and the sand used to get the paint off.

there water beds for my new house up there:D

Just tell them they can dump it down here on the Mississippi coast its prob cleaner anyway:cool-smiley-011:

Those are dredging bladders. They fill with the muck and filter the water back into the lake. The solids/polutants stay in the bladder. The bladder is then opened up and the muck material dries to the point where it can be scooped with a front end loader and shipped off to a disposal area.

Those are actually Jet Docks for 100' plus mega yachts.