Unstable Slope Management for Oregon Highways: Using Cost-Based Risk Assessment in Conjunction with Site Characteristics to Manage Landslide and Rockfall Effects on the Transportation System Curran Mohney, C.E.G. Engineering Geology Program Leader Oregon Department of Transportation

Program Goals: Locate and Rank all Unstable Slopes affecting the State’s Highways Prioritize and Select Projects Allocate Funds Provide Information to Policy and Decision- Makers Integrate Data and Analyses with Internal Disciplines and other Agencies

Program Criteria: ● Manage All Unstable Slopes Uniformly ● Manage Risk and Liability Uniformly ● Scale Higher-Order Analyses Relative to Site Priority ● Utilize An Impact-Based System ● Rank and Prioritize Landslides and Rockfalls in Accordance with the Federal Highway Administration’s Asset Management Concept

Asset Management: mgmt/index.htmhttp:// mgmt/index.htm Decision-Making Methodology Draws from Business and Economics Supplements Scientific and Engineering Analyses Supports Decision-Making –Evaluate Trade-Offs –Conduct “What-If” Analyses –Make Sound “Investment” Decisions

Unstable Slope Rating System: Hazard Score X Maintenance Benefit-Cost Factor X Highway Classification Factor = Final STIP Score

Unstable Slope Data Collection Procedures:

Unstable Slope Management Locate, Rank, Prioritize, and Select Sites for Repair Perform Analyses: Cost-Benefit, Life Cycle Cost, etc. Provide Information to Regions, Districts, Other Agencies, Public, etc.

Unstable Slope Risk Management

Questions ?