Abstract: A stowable agitation trenching apparatus for use on a vessel such as a dredge or barge includes an adjustable, vertically extendable and retractable elongate leg slidably disposed within a mounting bracket pivotally secured to the vessel for selectively disposing a distal end of the leg at a plurality of positions underneath the vessel. An agitation producing propeller is disposed adjacent to the distal end and is movable therewith for producing an eroding current of water against the bottom surface of a body of water to be trenched or dug. The vertically extendable and retractable elongate leg is arranged to be raised and pivoted in the mounting for substantially horizontal stowage on the vessel.