Welland Canal, Bridge 15, Steel swing bridge in Welland, Canada.

Bridge 15 is a steel swing structure with Baltimore truss design that crosses the Welland Recreational Waterway and carries two railway tracks with metal barriers at both ends. The construction was engineered to allow trains to pass while letting vessels navigate the canal below.

Bridge 15 was built around 1910 to replace a wooden bridge at the same spot, while the Third Welland Canal was still in use; it was designed to Fourth Canal standards that later proved too low. It carried the Canada Southern Railway main line until the canal relocation of 1967–1973 rerouted that line through the Townline Tunnel. One track stayed as an interchange link until the late 1980s, when service between Welland and Wainfleet ended.

The bridge's control cabin also served as an interlocking tower for the Toronto, Hamilton and Buffalo Railway junction, a crossover, the Niagara, St. Catharines & Toronto Electric Railway crossing and canal sidings, so it was staffed year-round, even when the canal closed for winter. A bell on the bridge rang whenever a ship struck it, warning the crew to check for damage.

Visitor access is restricted since this is an active railway bridge. It is best viewed from public pathways along the canal.

Power reaches the rotating span through an underwater cable run to the northern concrete fender, then up a pole and along a guy wire to a top-hat-shaped collector at the bridge's centre. That top-hat and the two fender poles are still visible. The bridge is owned by the Canadian Pacific Railway but connects to no other CPR track, and chain-link gates at both ends keep trespassers off.