UNSTABLE SLOPE MANAGEMENT: WASHINGTON STATE

This article discusses the development of an Unstable Slope Management System (USMS) by the Washington State Department of Transportation (WSDOT). The USMS is used to (a) rationally evaluate all unstable slopes, (b) perform early project scoping and cost estimation, (c) conduct benefit-cost analysis of unstable slopes, and (d) prioritize the mitigation of known unstable slopes according to the expected benefits.