English: Photo #: 80-G-437274 Carlson's Canyon Bridge Attacks, March-April 1951 Photograph Carlson's Canyon # 13, showing the bypass route established by the enemy following the destruction of the railway bridge in left center. The bypass, represented by dotted lines, was necessary to avoid the bridge and tunnels, which could be easily closed by air strikes. Though it included several small bridges, the bypass was not so easily knocked out and was more readily repaired. Task Force 77 carrier planes were therefore diverted southward in search of another vital choke point. Text below the image provides additional information. The Carlson's Canyon bridge was located on the rail line south of Kilchu, in northeastern Korea.