The county board shall supervise, regulate and control the flow within the boundaries of the county of the waters of any river, stream or water course over and through any and all dams and other obstructions, if any, now or hereafter existing or constructed in, upon or along any such river, stream or water course; provided however, that nothing in this Section contained shall empower any county to abridge or in any manner curtail any vested water power rights or other rights.