The Montrose Swing Bridge is located on the Welland River at the junction with the Queenston Power Canal in the southeast portion of the City of Niagara Falls, Ontario, Canada.

The canal was extended through to Lake Erie in 1833, but the Welland River remained in service as a commercial shipping channel for approximately another century.

It provided a route to the industries along the Niagara River and Buffalo, NY, as well as access to the Erie Canal without journeys through open water.

As ships increased in size, especially with the opening of the greatly expanded Fourth Welland Canal in 1932, the demand for navigation on the river diminished.

It now exists exclusively to service a couple of industries within the boundaries of the city of Niagara Falls and carries only one or two short trains per week.