Yosemite National Park, California, USA

In April 2006, a major rock slide took place burying State Highway 140, the main access to California’s world famous Yosemite National Park. With a volume of approximately 1.5 to 2.0 million cubic metres, the rock slide created significant concern for public safety. In June 2006, unable to determine whether the slide mass was slowly creeping, accelerating, decelerating or completely at rest, GroundProbe’s Slope Stability Radar (SSR™) was brought in. Within an hour of deployment, the movement of the land slide was correctly identified.

The collaboration between the California Department of Transportation and GroundProbe allowed the risk to public safety to be correctly identified and managed. Alternative access to the park was established, restoring vital tourism to the local economy.

Today, the SSR™ continues to monitor the area and keeps the California Department of Transportation continually informed of any movement in the affected area.

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