A southbound Grand Trunk Western train crosses the Black River in Port Huron, Michigan on April 8, 2018. GP38-2 #5847 leads on this branch after serving Dunn Paper. The Bascule Bridge was built in 1929 and raises to allow large boats to pass. It is kept down during the winter months in the off season for boaters. In the summer months, the bridge is kept in the raised position and only lowered to allow trains to cross. This railroad spur is less than 4 miles long. It used to be a main line and was built in 1859 for Grand Trunk Western’s predecessor Chicago, Detroit & Canada Grand Trunk Railroad.