The replacements of the Kirjalansalmi and Hessundinsalmi bridges aimed to improve road connections for industrial companies as well as create a pleasant and safe route to the archipelago for all road users. The Hessundinsalmi Bridge was opened for traffic on October 2024 and the Kirjalansalmi Bridge was opened on November 2025.

WSP in Finland was responsible for the general, road and construction design of the Kirjalansalmi Bridge and for the road design of the Hessundinsalmi Bridge. In addition, we designed the installation process and the necessary temporary structures for the bridge over the Kirjalansalmi Strait together with the steelwork supplier SGP.
 

Smooth connections to the archipelago

The new Kirjalalansalmi Bridge is a composite girder cable-stayed bridge. It consists of two high-pylon girders, which support the main span of the bridge (about 265 m long) by means of diagonal cables. The bridge has the largest span of all bridges in Finland.
 

Cliente

Estado do projeto

  • Completed

The bridge in figures

Width
16 m
Main span
265 m
Length
675 m

A wider bridge deck with new lane arrangements at the junctions and two underpass tunnels for cyclists and pedestrians make travel faster and safer for all road users. Accessibility to public transport was improved with new bus stops and connections. In addition, the construction of new noise barriers near both bridges enhances the residential amenity impact.
 

An impressive bridge that blends in with the surrounding nature

Kirjalansalmi Bridge has been designed with the environment in mind. The restrained design is supported by lighting that accentuates it. In addition, the bridge’s noise barriers are made of transparent material to preserve the integrity of the landscape.

With the old bridges removed, the aim is to restore the new bridges and roadbeds to their natural state and enliven the maritime landscape with trees and greenery.
 

Hero picture copyright: Kreate, Arttu Kaarakainen

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