Abstract: A boom pivotally mounted for rotation about a vertical axis on a support vehicle which may be a floating barge or heavy truck. The boom is extensible and retractable in the radial direction and mounts, at a distal end, a cable supporting a dredging apparatus. The dredging apparatus in a preferred embodiment comprises a single cutter head assembly mounted above and just forward of a single pump both of which are driven by electric power supplied by a generator on the support vehicle. In a preferred embodiment, the cutter head comprises a central support section and a plurality of blades attached to the central support section at each end with a mid-portion extending outwardly of the support section. In a further preferred embodiment, the pump assembly comprises an electric motor in a sealed housing, connected to a pump including an impeller driven by a shaft connecting the impeller and the electric motor.