Centennial Bridge is a steel through arch crossing the Miramichi River in Northumberland County, New Brunswick, Canada. The bridge is 1.1 km long, and 240 feet high. It carries Route 11, Route 8, and Route 134 over the river, connecting Douglastown on the north bank with Chatham on the south bank; both communities were merged with others in the vicinit…Centennial Bridge is a steel through arch crossing the Miramichi River in Northumberland County, New Brunswick, Canada. The bridge is 1.1 km long, and 240 feet high. It carries Route 11, Route 8, and Route 134 over the river, connecting Douglastown on the north bank with Chatham on the south bank; both communities were merged with others in the vicinity through municipal amalgamation into the city of Miramichi.