LANDSLIDE TECHNOLOGY
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Hwy 2 Rockfall Mitigation

Libby, Montana
Scaling 250 feet above Highway 2 and BNSF RailroadScaling 250 feet above Highway 2 and BNSF Railroad
A wedge failure developed in a new rock cut slope along U.S. Highway 2 west of Libby soon after construction. Within ten years, the wedge failure had retrogressed beyond the crest of the original cut slope to form a trough, extending approximately 130 feet into the slope that was over 150 feet wide and nearly 200 feet high. Due to the slope height, continuing rockfall activity, concerns for worker and traffic safety, and a history of vehicle involvement; the Montana Department of Transporation (MDT) retained Landslide Technology (LT) to develop mitigation measures to reduce rockfall hazards. Tasks included detailed geologic and rock structural mapping, rockmass characterization, stability analyses, computer rockfall simulations, and development of rockfall mitigation measures.

Mitigation measures included scaling, shotcreting, rock bolts, draped ring nets, and a rockfall barrier fence. LT developed final design plans and special provisions were developed for MDT to include in bid package documents. Following the bid letting, LT provided continuous technical support during construction activities.



Services Provided:

  • Rock Slope Investigations
  • Rockfall Mitigation
  • Hazardous Rock Removal and Stabilization
  • Rockfall and Wedge Stability Modeling
  • Rock Slope Hazard Assessment
  • Rock Bolt, Rockfall Barrier, and Draped Mesh Design


  • Home
  • Landslides
    • Hydropower >
      • Bull Run Flume
      • Swift Powerhouse
      • Frog Lake Dam Slide
    • Transportation >
      • Hwy 101 Johnson Creek
      • Looking Glass Hill Slides
      • SR 87 Arizona Slide
      • Togwotee Pass Road
      • Scoby Hill Landslide
      • Wrangell Airport
      • Snowbasin Access Road
      • Beartooth Debris Flows
      • Three Capes Scenic Loop Landslide
      • Richardson Hwy Slide
      • Bonners Ferry Landslide
      • Light Rail Station
      • Skagway Submarine Slide
    • Natural Resources >
      • West Africa Gas Pipeline
      • Greens Creek Mine Road
    • Private Clients >
      • Wasco County Landfill Landslide
  • Rock Slopes
    • Hydropower >
      • Biscuit Rock Rockslide
      • Skagit River Rockfall
      • JC Boyle Canal Rockfall
      • Prospect Dam Rockfall
      • Iron Gate Dam Rockfall
      • Cougar Dam Rockfall
    • Transportation >
      • I-15 (D3) Rock Slope Mitigation
      • Ketchikan Third Avenue
      • US Hwy 2 Libby Rockfall
      • Banks - Lowman Hwy
      • SR 191 Rock Cut Design
      • Going-to-the-Sun Road
      • SR 12 Rockfall Mitigation
      • Lakeside Rockfall
      • US 2 Badrock Canyon
      • South Tongass Highway
      • Weeksville Rock Bolting
      • US 26 Cove Palisades
  • Specialty Services
    • Geotech. Asset Mgmt. >
      • Montana Rock Slope Asset Mgmt. Program (RAMP)
      • Alaska Geotech Asset Mgmt
      • Ohio Landslide Inventory
    • Rope Access
    • 3D Modeling
    • Dam Safety & Slope Stability
    • Const. Sequence Modeling
    • Geotechnical Instrumentation
    • Construction Engineering
    • Expert Witness
  • Staff
  • Resources
  • Careers
    • Geotechnical Engineer
  • Contact Us