1971 Map of Thunder Bay Island

About this map

Thunder Bay Island and its neighboring landforms emerge from the waters of Lake Huron in this survey of the northeastern Michigan coastline. This island group within Alpena Twp is defined by a landscape of shallow shoals and isolation, anchored by a historic Lighthouse on the eastern tip of the primary island. The map preserves the precise mid-century topography of these islands before modern automated systems or changing lake levels altered their character.