Implenia to build “complex and sensitive” rail bridge across Norwegian lake

Implenia/Norconsult’s rendering of the planned bridge across Lake Mjøsa
Norwegian rail operator Bane NOR has commissioned Swiss contractor Implenia to build a 1,022m-long railway bridge across Lake Mjøsa in the south of the country.

The double-track Tangenvika bridge, set to be Norway’s longest railway bridge, has a construction price tag of around €200m, and will be made from prestressed concrete.

A section of it will be on land and will have a “wildlife overpass” to protect the rich ecosystems in and around the lake.

Located about 50km north of Oslo, the lake is a source of drinking water, so Bane NOR’s brief for the bridge was that construction should take place with the least possible impact on the environment, and that excavated soil and rock should be dealt with using as few transport trips as possible.

Implenia was awarded the engineering, procurement and construction contract after achieving the best ratings on quality and price, the company said.

Christian Späth, the company’s head of civil engineering, commented: “The project has a clear focus on sustainability – one of Implenia’s five corporate values. We will live this in the project by working systematically to meet both the technical and ecological requirements.”

The project will start in the next few weeks and is expected to be completed in 2027.

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