Independence Dam State Park occupies 591 acres along the Maumee River near the confluence with the Auglaize east of Defiance, preserving a landscape shaped by Native travel, canal building, and environmental change. Native peoples including the Iroquois, Miami, Lenape, Ottawa, Erie, Wyandot, and Shawnee used this river junction, and Pontiac and Blue Jacket are associated with the area. In the 19th century, the Miami and Erie and Wabash and Erie canals crossed here, helping regional trade grow before railroads replaced them. The park retains canal ruins, the concrete Independence Dam, and rare wooded riverbanks from the former Great Black Swamp. Opened in 1949, it remains a public recreation area.