Menu

LANDSLIDE HAZARD ASSESSMENT OF THE PROPOSED SITE OF THE KLOSER CABIN, RICHMOND HILL, ASPEN AREA, COLORADO

The Richmond Hill area north of the proposed cabin had been shown by previous GEO-HAZ mapping (done for Aspen Skiing Company) to contain some Quaternary landslides on the ridge flanks. We extended that mapping southward to the cabin site and identified some additional flank landslides with lidar and Google Earth. However, the cabin sits on an intact ridge of Ordovician Manitou Dolomite, which is not generally susceptible to slope failure in the Aspen area or elsewhere in Colorado. Bedrock strata beneath the cabin activity envelope dip west at 35°-40°, much steeper than the surface slopes of 13°-16°, meaning the beds do not “daylight” in the downslope direction, which further implies a very low potential for translational or wedge-failure landsliding.