Three Nations Crossing

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North Channel Bridge of Three Nations Crossing

Crosses	Saint Lawrence River
Locale	Cornwall, Ontario
Maintained by	Seaway International Bridge Corporation
Design	Truss bridge
Total length	1,652 m (5,420 ft)
Width	8.2 m (27 ft)
Opening date	1962

South Channel Bridge of Three Nations Crossing
Crosses	Saint Lawrence River
Locale	Cornwall, Ontario/Massena, New York
Maintained by	Seaway International Bridge Corporation
Design	suspension bridge
Longest span	275 m (902 ft)
Total length	1,060 m (3,478 ft)
Width	8.2 m (27 ft)
Opening date	1958

The former Seaway International Bridge, renamed the Three Nations Crossing in 2001, is a bridge over the St. Lawrence River in east-central North America. It is an international bridge, connecting the city of Cornwall, Ontario in Canada to Roosevelttown near the village of Massena, New York in the United States.

The bridge is jointly owned by the Federal Bridge Corporation and the Saint Lawrence Seaway Development Corporation. It is operated by the Seaway International Bridge Corporation, which came under the control of the Federal Bridge Corporation from the Saint Lawrence Seaway Authority in 1998.

Previously known as the Cornwall-Massena International Bridge, the SIB was a private bridge whose outstanding stock was purchased by the Saint Lawrence Seaway Authority (Canada) and the Saint Lawrence Seaway Development Corporation (U.S.) in 1957. It was incorporated in Canada five years later.

The bridge consists of the South and North Channel Bridges. The South Channel Bridge was opened in 1958, and spans the St. Lawrence Seaway. The North Channel Bridge, opened in 1962, connects the City of Cornwall to Cornwall Island.

In 2000, the international border crossing that the Seaway International Bridge comprises was named the Three Nations Crossing, in honour of the Mohawks of Akwesasne who inhabit the region.