Therefore, the objectives of this investigation as undertaken by U of M researchers were to 1) provide baseline limnological data on the aquatic resources of the Lower Platte River region from Platte Lake to the river mouth at Lake Michigan; and to 2) respond to a request from the National Park Service to critique their Master Plan for management of the Sleeping Bear Dunes region based upon our accrued knowledge of the sensitivity of the parkland’s aquatic resources.