N02 Lehnen viaduct Beckenried Project measures

The Lehnen Viaduct Beckenried on the N02 national road stretches over a length of around 3.15 km between the Beckenried junction and the north portal of the Seelisberg Tunnel. This makes it one of the longest bridge structures on the Swiss national road network. The Lehnen Viaduct was put into operation in 1980 and is to be upgraded for intervention-free operation over the next 15 years as part of an action project (MP). As part of the MP, extensive construction work will be carried out, such as a complete replacement of the surface, the repair of various bridge bearings and Gerber joints, local concrete repairs and various adjustments to the operating and safety equipment (OSA). The Federal Roads Office FEDRO has commissioned Ecosens AG to act as the environmental project author (PV Umwelt). The environmental impact during the construction and operating phases is already being examined during the project planning phase and numerous environmental assessments are also being carried out. The findings are described in an environmental note and measures for the construction and operational phases are defined on this basis. These measures and any conditions imposed by the authorities ultimately form the specifications for the environmental construction supervision during the construction phase. The project will be realized under traffic conditions and will therefore be carried out in two stages in 2026 and 2027.