Patoka Bridges Historic District is a national historic district located in Columbia Township, Gibson County, Indiana and Logan Township, Pike County, Indiana. The district encompasses two contributing bridges, known as Pike County Bridge #246 and Pike County Bridge #81. Pike County Bridge #246, also known as the Iron Dongola Bridge, was built in 1884 by the Wrought Iron Bridge Company. It is a Pratt through truss wrought and cast iron bridge measuring 124 feet long. Pike County Bridge #81, also known as the Steel Bridge at Houchins Ditch, was built in 1924. It is a camelback through truss steel bridge measuring 145 feet long.