2014 Map of Thunder Bay Island

About this map

Thunder Bay Island and its smaller neighbors, Sugar Island and Gull Island, are depicted here within the waters of Lake Huron. This 2014 survey captures these landforms as they existed in the early 21st century, showing the precise shapes of the island chain off the Michigan coast. The map provides a look at the surrounding maritime geography, which includes portions of t31n r10e and t30n r10e. Because these islands are separated from the Alpena County mainland, the sheet focuses almost entirely on the hydrography and the natural terrain of the three primary islands. The proximity of Sugar Island to the larger Thunder Bay Island suggests a geological connection in this portion of the lake, offering a clear reference for researchers studying the offshore features of the Thunder Bay region.