n a bridge ??? that is on, over, under or through navigable water6.Removal or destruction of a wreck, vessel or other thing pursuant to section 16 of the Navigable Waters Protection Act7.Removal of a vessel or other thing pursuant to section 20 of the Navigable Waters Protection Act8.Watercourse training ??? such as that for the purpose of erosion control or that which is by means of a channel or