Brookfield, NoahA survey map of the islands in the St. Joseph River located in the western portion of Mottville Township in St. Joseph County, Michigan and the southern portion of Porter Township in Cass County, Michigan.JPEG20006e8a1c4d-b441-4013-91c8-4d36ca44b3e5MI-T008S-R013WengDepartment of Natural Resources8888-003Public08S 13W - Survey Map of Mottville Township, St. Joseph County & Porter Township, Cass County, Page 2 [Michigan]MapsMichigan--CassT008S-R013W1845