A thousand birthday greetings for US-Canada Thousand Island Bridge

The Canada-US Thousand Island Bridge system celebrated its 80th birthday in August with presentations and an open house at its US headquarters. The 33.7km three-bridge system over the St Lawrence River took 16 months to build and was completed 10 weeks ahead of schedule. It runs from Collins Landing near Alexandria Bay in the US state of New York to the small town of Ivy Lea in the Canadian province of Ontario. The system connects US Interstate 81 and Canada’s Highway 401, a major motorway between Montre
August 21, 2018 Read time: 2 mins
The Canada-US Thousand Island Bridge system celebrated its 80th birthday in August with presentations and an open house at its US headquarters.


The 33.7km three-bridge system over the St Lawrence River took 16 months to build and was completed 10 weeks ahead of schedule. It runs from Collins Landing near Alexandria Bay in the US state of New York to the small town of Ivy Lea in the Canadian province of Ontario. The system connects US Interstate 81 and Canada’s Highway 401, a major motorway between Montreal and Toronto, ending in Windsor on the Ontario border with the US state of Michigan.

The 1,370m crossing over the American channel of the river - from the US mainland to Wellesley Island - consists of a suspension bridge with a main span of around 245m and nearly 46m of clearance above the river.

The Canadian crossing includes the 183m continuous Warren Truss span connecting Hill Island to Constance Island, a steel arch of 106m spans from Constance Island to Georgina Island and a suspension bridge of 229m from Georgina Island to the Canadian mainland. The Canadian span from abutment to abutment is 1,015m and the suspension span provides 37m of river clearance.

The boundary at the International Rift boundary – the channel between Wellesley Island and Hill Island - is bridged by two parallel 27.4m rigid-frame arched spans of reinforced concrete with masonry facing. Originally there was only one bridge at boundary but due to increased traffic it was twinned in 1959.

Operation of the Thousand Islands Bridge system is shared under a joint agreement that created the US based Thousand Islands Bridge Authority which estimates that there are 2,000 vehicle-cross the annually. The system’s original consulting engineer was Robinson and Steinman of New York City that  continues to do so today but as 3220 Parsons Transportation, notes the authority.

Road Structures

For more information on companies in this article

Related Content

  • Kronprinsesse Marys Bro bridges Roskilde Fjord
    January 10, 2019
    A BESIX joint venture is giving the royal treatment to the new Kronprinsesse Marys Bro across Roskilde Fjord, writes David Arminas It was announced in September 2016 that Belgian group BESIX, in a joint venture (RBAI) with Italian firm Rizzani de Eccher and Spanish company Acciona Infraestructuras, had been chosen for the €133 million project. The award, by client Vejdirektoratet (Danish Road Directorate), marked the entry of BESIX into the Scandinavian market. Vejdirektoratet praised the winning bid as
    Read More
  • BC to renovate Simon Fraser Bridge
    January 20, 2022
    The Canadian province will rehabilitate the deck structure of the southbound bridge of the twin-bridge river crossing in Prince George.
    Read More
  • Managing urban motorway complexity in Sydney
    October 4, 2012
    Sydney’s Hills M2 motorway is being widened while still carrying traffic and meeting tough environmental criteria More than 100,000 vehicles and over 27,000 bus commuters use the Hills M2 motorway on a typical workday, making it one of Sydney’s busiest motorway corridors. Owned and managed by Hills Motorway Ltd (HML) and a key part of the city’s orbital motorway network, the road stretches over 21km, providing a seamless link between the Lane Cove Tunnel and Westlink M7. The Hills M2 Upgrade is one of many
    Read More
  • Building Norway's longest suspension bridge
    March 2, 2012
    AT 1.38KM LONG, the new €213 million Hardanger Bridge crossing Hardangerfjord, Norway's second largest fjord, will be the country's longest suspension bridge. The structure, designed by Norway's Forum Arkitekter, will be a new landmark with its 200m high concrete towers and steel construction.
    Read More

Highlighted Content