1916 Map of Casco Bay

About this map

Fort Williams and Fort Levett stand as prominent coastal defenses along the approaches to Portland harbor in this early twentieth-century survey. The landscape is defined by its deep maritime heritage, from the bustling waterfront at South Portland to the steamer routes that connected these islands to the mainland, such as the Boston and New York Steamboat Route. On Great Diamond Island, Fort McKinley anchors the northern defense, while residential clusters like Mariner on Long Island and Trefethen Landing on Peak Island show the seasonal and year-round communities of the bay.