The invention comprises a lake bottom cleaning device. The device has a self supporting base and a elongated boom mounted centrally of its length to the base as a location spaced above the bottom of the base, whereby the base may support the base and boom on the bottom of a lake with the boom spaced parallel above the bottom of the lake. The boom has flexible depending weed engaging means and the boom has a hollow interior with water ports in their outer ends directed in a manner whereby the boom may be connected to a source of water under pressure which water may be delivered into the boom and out the outer ports at the outer ends of the boom with the water propelling out the boom ports providing a jet action to propel the boom to rotate about its rotational mounting to the base with the depending drag means depending onto the lake bottom to engage and drag and clean the lake bottom of weeds on the lake bottom as the boom is rotating by the water propelling action.