The following bridges are known as the International Bridge:

The Sault Ste. Marie International Bridge spans the St. Marys River between the United States and Canada connecting the twin cities of Sault Ste. Marie, Michigan and Sault Ste. Marie, Ontario. It serves as the northern terminus of Interstate 75 (I-75). The International Bridge began construction in 1960 and officially opened to traffic on October 31, 1962. Daily operation is carried on by the International Bridge Administration (IBA) under the supervision of the Sault Ste. Marie Bridge Authority (SSMBA). The SSMBA replaced the previous Joint International Bridge Authority (JIBA) in 2009, which in turn had succeeded the International Bridge Authority (IBA, created in 1935) in 2000.

This is a steel truss arch bridge with suspended deck. There are two separate spans, a double arch span on the U.S. side and a single arch span on the Canadian side. The double arch spans cross the four U.S. Soo Locks. The single arch spans the single Canadian Lock. In Sault Ste. Marie, Ontario, the bridge ends at a city street, Huron Street, in the downtown core. The total length of the bridge approaches 2.8 miles (4.5 km). The Bridge Authority allows bicycles to cross; however, there are no dedicated bike lanes. Cyclists must take proper precautions to ensure visibility.

The International Railway Bridge carries a railway line across the Niagara River between Fort Erie, Ontario, Canada and Buffalo, New York, United States. It was built in 1873 for the International Bridge Company by Casimir Stanislaus Gzowski and D.L. MacPherson.

The bridge consists of two sections, the first extending from the Canadian shore to Unity Island (formerly known as Squaw Island,) and the second extending from Unity Island to the American mainland shore. The portion between these was originally built on a trestle, but was filled to form an embankment soon after the bridge opened. Once on the American mainland, rail traffic is received by the Black Rock Rail Yard. The CN Rail Fort Erie Yard for interchange (shops and roundhouse) is now closed.

The need for a bridge

Before bridges crossed the Upper Niagara River, it was crossed by several ferries running between Fort Erie and Buffalo. As well as being a serious bottleneck to both freight and passenger traffic, this crossing was often dangerous as the current in this area is swift, and ice is a problem several months of the year.