Landslide Caused by
Removal of Lateral Support

This is a slide of a small landslide on the road from Golden, to Boulder, Colorado. This is typical of roadside landslides in many areas of the nation. The slide resulted from too steep a road cut and the saturation of the slope from groundwater. It cost federal, state, and local governments $4 million to evaluate and remedy this small slide. Remedial measures included giant tiebacks holding the slide material into the bedrock, together with an elaborate drainage system.

This landslide is similar to the Anaheim Hills landslide in that when the road was cut it caused a weakening in the hill because of the removal of needed lateral support. Mark McLarty, the head geologist for the City of Anaheim stated that "when Serrano (Road) was graded the removal of lateral support weakened the hill."