Bridge # 35-04-16 Doyle Road, or Mullen Covered Bridge is a 94 feet long covered bridge that spans Mill Creek in Jefferson Township, Ashtabula County, Ohio. Built in 1868, the Town lattice truss structure is 90.9 feet long, with the largest span length of 79.1 feet and deck width of 18.4 feet. The vertical clearance above deck is 13.7 feet.