The B151 in Innerschwand will be closed to all traffic starting the evening of Sunday, May 3, 2026. This total closure is a precautionary measure following the discovery of acute slope instability in the area.
Geological Risks and Immediate Danger
The instability is located on the B151 Atterseestraße between kilometer 35.170 and 35.265. The slope above the provincial road exhibits significant deformations and is at risk of sliding onto the roadway.
A geologist consulted on April 29, 2026, identified cracks spanning roughly 100 meters and terrain shifts of up to 1.2 meters. Due to predicted precipitation in the coming week, officials warn that a landslide could occur on short notice.
Traffic Diversions and Restrictions
The total closure will apply to all road users, including those using bicycles. To maintain traffic safety, specific diversions have been established.
Truck traffic will be diverted on a large scale. For passenger cars and cyclists, the designated diversion route is via the L543 Kienbergwandstraße.
Recovery Plan and Timeline
Remediation work is scheduled to begin on Monday, May 4, 2026. The initial phase involves removing the unstable mass until the load-bearing rock base is reached.
Following the removal of debris, further geological and geotechnical planning will be conducted to ensure the permanent securing of the slope. Officials stated that the total duration of the closure cannot be estimated at this time.
Depending on how the situation evolves on-site, the total closure may be moved forward on short notice.
Frequently Asked Questions
When does the B151 closure begin?
The total closure takes effect in the evening hours of Sunday, May 3, 2026.
What are the diversion routes for drivers?
Passenger cars and cyclists are diverted via the L543 Kienbergwandstraße, while truck traffic will be diverted on a large scale.
How long will the road remain closed?
The duration of the closure cannot be estimated at this time, as further geotechnical planning is required for permanent stabilization.
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