Renovation of the Kerenzerberg Tunnel
From March 2026, the renovation of the Kerenzerberg Tunnel on the A3 motorway at Lake Walen is set to begin. However, the renovation work will cause particular frustration among travelers, as night closures are necessary and complete closures will also occur during the course of the work. The renovation is expected to last until the end of October 2028. The main reason for the renovation of the Kerenzerberg Tunnel is the removal of the intermediate ceiling, so that the tunnel height can be expanded to 5.20 m. In addition, the tunnel's operational and safety equipment will be renewed.
Night closures and complete closures
When are the night closures?
The renovation work will not only lead to occasional closures, but to regular restrictions on road traffic. Accordingly, the night closures are to take place weekly from Sunday (10 p.m.) to Monday (6 a.m.) as well as from Monday to Friday, each from 8 p.m. to 6 a.m. On weekends and public holidays, the tunnel will therefore remain open. During the night closures, traffic will be diverted onto the lakeside route with oncoming traffic.
When are the complete closures?
The Kerenzerberg Tunnel is expected to be fully closed from April 12, 2026 to May 8, 2026 and from May 31, 2025 to June 26, 2026. The closures will accordingly each run from Sunday evening to Friday noon, so that the Kerenzerberg Tunnel remains open continuously during busy weekends.
Even though only these complete closures have been announced so far, further complete closures in 2027 cannot be ruled out. According to a spokesperson from Astra, the exact schedule is not yet available, as it is necessary to wait and see how the renovation work progresses. If further dates for complete closures are announced, we will let you know for which periods.
Renovation of structures before the Kerenzerberg Tunnel
In addition to the Kerenzerberg Tunnel, structures in front of it will also be renovated. Accordingly, the renovation of the bridge over the Escher Canal in the direction of Sargans will begin on March 1, 2026, and is expected to be completed by early August 2026. Among other things, the road surfaces will be renewed. During the renovation work, the bridge will remain passable with two lanes.
The Europamaut team wishes you a pleasant journey!
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