Abstract: A self-powered, self-contained mobile dredge for removing silt and other bottom sediment from the bottom surface of a body of water, such as a canal, which accumulates as a result of erosion caused by rain and irrigation. A submersible drive unit of the dredge includes a continuous track drive, including left and right tracks, providing sufficient traction and mobility while exerting minimum ground pressure to enable the dredge to be driven along the bottom surface of a canal, while further enabling entry and exit from within the canal and transit across terrain between canals. A housing is movably mounted on the drive unit and is both rotatable about an arc of 360.degree. and vertically adjustable relative to the drive unit. A dredge unit, movable between a raised position and a lowered position extends from a forward end of the housing and includes a scoop having a tiller assembly therein.