The Half Chance Iron Bridge, also known as the Half-Chance Bridge, is a historic single span wrought iron bridge located near the small community of Half Chance, between the towns of Linden and Dayton in rural Marengo County, Alabama. It is on Marengo County Road 39 over Chickasaw Bogue Creek. The bridge is the oldest surviving iron bridge in Alabama, making it an important transportation and engineering landmark for the state.County Road 39 has been moved over the years.