B15, bridge over the Mangfall river and canal

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Ice age meets modern age

connecting people

Federal Highway B15 is an important Bavarian north–south connection east of Munich’s metropolitan area. The construction of the western section of the Rosenheim ring road (Westtangente Rosenheim) reduces traffic in the town and increases the residents’ quality of life. The heart of the construction is the 192.5?m Aicherpark Bridge crossing both the Mangfall River and the Mangfall Canal.

paving the way

The flexible cable-stayed bridge was the best design for the difficult subsoil conditions. The subsoil, consisting of basin deposits, is a leftover from the ice age and prone to excessive settlement that had to be taken into account. The superstructure counters this problem by means of pylons clamped into the structure and traditional supports. Intelligent move. The entire construction can be lifted if required. The 50?m foundation elements are not visible yet crucial. Bored piles, drainage columns and displacement piles transfer the loads to the marine clay soil.

creating construction culture

The extradosed bridge with short pylons and shallow cables blends harmoniously into its environment. The structure does not steal the limelight from the tall trees nor from the buildings of the adjacent Aicherpark. The exterior longitudinal girders form a continuous visual band with the pylons. The cables are not anchored into consoles but into the inside of the girders, which creates a structurally, economically and visually durable construction. Ready for the next ice age.

Year of completion


Type of intervention

New construction

Contracting authority

Staatliches Bauamt Rosenheim



Type of structure

Road bridge

Construction method

Temporary accommodation frame, cantilevering

Construction material of superstructure

Reinforced concrete, steel, steel composite

Total length

192,50 m

Type of structural system

Cable-stayed bridge

Span lengths


Construction height

1,25 - 1,50 m

Construction width

14,45 m

Services Grassl

Preliminary design, detailed design, planning for approval, construction planning, preparation of tendering, assistance for tendering, construction management, construction supervision, visualisation, building information modelling

Services provided by engineering consortium

Latest news about the project

Virtual VHK lecture on 26 October 2021

At 6.15 p.m. on 26 October 2021, at the VHK career fair, Jacqueline Donner, a team leader of the Munich office, will deliver the (virtual) lecture ...

Together on site once more

On 21 July 2021, the Munich office attended a site visit to the Mangfall Bridge in Rosenheim ...

Construction continues on the Mangfall Bridge in Rosenheim

The construction of the superstructure of the Mangfall Bridge in Rosenheim is making big steps forward …