links Grand Lake St. Marys State Park Ohio Department of Natural Resources Grand Lake St. Marys Fishing Map Ohio Department of Natural Resources The Lake Improvement Association Ohio EPA's Assessment of Grand Lake St. Marys Ohio EPA's Grand Lake St. Marys Toxic Algae page State parks of Ohio Protected areas of Auglaize County, Ohio Protected areas of Mercer County, Ohio Protected areas established in 1949 1949 establishments in Ohio Bodies of water of Auglaize County, Ohio Bodies of water of Mercer County, Ohio Reservoirs in Ohio Nature centers in Ohio