Landslide Technology
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Skagit River Hydroelectric Facilities Rockfall

Diablo, Washington
Diablo and Ross Dams and their associated facilities, located in the North Cascades National Park, are surrounded by steep, rocky terrain susceptible to rockfall and rock slide events.  Landslide Technology (LT) was retained by Seattle City Light to perform a geohazard investigation to design rockfall mitigation measures for the rock slope immediately behind the Diablo Dam Powerhouse.  

To prevent scaled rocks from impacting the historic powerhouse, extensive protection measures were designed, including a series of rockfall fences and other temporary protection measures for use during thorough scaling operations.  Rock bolting has occurred concurrently with construction of several attenuator fences.

Prior to the completion of this work, a significant rock slide, comprising of about 15,000 cubic yards of debris, occurred near Ross Powerhouse.  The failure destroyed the Ross Dam barge landing and the Ross Lake Resort boat dock.  LT was retained on an emergency basis to provide rock slope design services and full time construction support.  Mitigation and construction included extensive scaling, blast excavation , and rock bolting. 
Picture
Large Rock Slide Blocking Access to Ross Dam and Powerhouse

Services Provided:

  • Rock Slope Investigations
  • Rock Cut Slope Design
  • Wedge, Planar, and Toppling Stability Modeling
  • Rockfall Mitigation
  • Rock Slope Hazard Assessment
  • Hazardous Rock Stabilization
  • Rock Bolt, Rockfall Fence, Draped Mesh, and Nailed Mesh Design
  • Rock Slope Instrumentation
  • Emergency Response and Fast-track Mitigation Design
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  • Home
  • 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
  • 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
  • Key Staff
    • Mike Meyer
    • Gerry Heslin
    • George Machan
    • Charlie Hammond
    • Brent Black
    • Darren Beckstrand
    • Chris Carpenter
    • Ben George
    • Wade Osborne
    • Tom Westover
    • Aine Mines
    • Adam Koslofsky
    • Logan Allender
    • Andy Kost
    • Collin McCormick
    • Anna Casady
    • Noah Kimmes
    • David LaPorte
    • Justin McCarley
    • Aleyna Donaldson
    • Michael Bunn
    • Andy Vessely
    • Larry Pierson
    • Derek Cornforth (Founder)
  • Resources
  • Contact Us