Before you spend $5000.00, look into making your own dredge. You don't need the floats, etc. that Keene uses to support the dredge unit. Instead, place a gas operated pump on the shore with the suction hose in a few feet of clean water, run the discharge to your venturi (make or buy one), and then divert the dredged material from the venturi over the dam. Keep in mind that dredging uses the motive force of a relatively small volume of water to entrain more water / sediment; extended dredging could significantly lower water levels without rainfall to replenish the pond. With the venturi on a pole, this could be done from a boat. Only problem is removing stuck material from the venturi opening.
