A9 Simplonstrasse – Josef Gallery as Part of the Kaltwasser Gallery – Kulm Tunnel – Josef Gallery Project

Rehabilitation of the road Simplonstrasse and reinforcement of Josef Gallery:

  • Replacement of the avalanche gallery: reinforcement of the existing structure, rehabilitation and reinforcement of the Gerber joint.
  • Replacement of the existing road bridge.
  • Physical connection of the gallery with the repaired Kulm Tunnel via a new portal.
  • A new comprehensive concept for load-bearing structures was developed and implemented for the gallery, bridge and tunnel portal.
  • There are no possibilities to divert traffic. The solutions for all works were designed to be implemented without interrupting traffic.
  • The entire project included the renewal of Kaltwasser Gallery and the Kulm Tunnel.

Main Data

  • Length of the gallery: 267m
  • Length of the bridge: 40m
  • Length of the tunnel portal: 4m


Swiss Federal Roads Authority ASTRA Thun Branch, Visp Office


IUB Engineering AG in consortium

Construction period


Construction costs

Construction: CHF 22 Mio. / Operation & safety systems: CHF 6 Mio.

Scope of services

  • Project planning and implementation
  • Technical monitoring