LANDSLIDE TECHNOLOGY
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Skagway Dock Submarine Landslide

Skagway, Alaska
A massive submarine landslide destroyed a timber dock on the east shore of Skagway harbor. At the time, the dock was undergoing a $3.5 million reconstruction for large cruise ships. The landslide failed along the narrow shoreline, pulled 600 feet of the dock under water and scoured the harbor sediments to depths of 70 feet. A resultant wave damaged boats and docks in the harbor, requiring $2 million to repair the state's ferry terminal. One fatality occurred as a dock reconstruction worker was trapped and pulled below water.
​
Landslide Technology was retained by the Alaska Department of Transportation and Public Facilities to investigate the cause of the landslide. There was extensive review of reports, surveys and historic photographs. Five overwater borings were drilled in winter conditions, in water depths ranging from 80 to 210 feet with extreme tidal fluctuations of up to 20 feet, to collect samples and perform in-situ strength tests. The fieldwork, along with laboratory work and analyses of slope stability, provided information essential to ascertain what caused the slide. Expert testimony was provided to help determine liability.
Skagway Dock Failure
Skagway Dock Following Failure

Services Provided:

  • Emergency Response assessments
  • Geologic reconnaissance of landslide areas
  • Site investigations by borings
  • Slope stability analyses
  • Expert witness services
  • 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