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1998 Kelso, Washington, Landslide

1998 Kelso, Washington, Landslide. Second largest suburban landslide in U.S. history Exceptionally unstable geology Troutdale Formation overlies Cowlitz Formation The contact is a potential failure surface FEMA -funded buy-out 137 homes damaged to some extent

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1998 Kelso, Washington, Landslide

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  1. 1998 Kelso, Washington, Landslide • Second largest suburban landslide in U.S. history • Exceptionally unstable geology • Troutdale Formation overlies Cowlitz Formation • The contact is a potential failure surface • FEMA-funded buy-out • 137 homes damaged to some extent • 127 homes to be purchased • Owners paid a maximum of 37.5% of house value

  2. Kelso, WA Landslide: Locator Map

  3. Kelso, WA Landslide: Overview

  4. Upper Aldercrest: A Down-Scarp View

  5. Upper Aldercrest: Small Scarp

  6. Upper Aldercrest: A Plumb Well

  7. Upper Aldercrest: Hanging Driveway

  8. Upper Aldercrest: Downdropped House

  9. Upper Aldercrest: Separated Section

  10. Upper Aldercrest: Part of the Driveway

  11. Upper Aldercrest: Rotated Structures

  12. Upper Aldercrest: Hanging Structure

  13. Upper Aldercrest: Missing Foundation

  14. Upper Aldercrest: Separated Section

  15. Upper Aldercrest: Torn & Twisted

  16. Upper Aldercrest: Separated Masonry

  17. Upper Aldercrest: An Abrupt Scarp

  18. Upper Aldercrest: Hanging Roof

  19. Upper Aldercrest: Tilted Plumb Well

  20. Lower Aldercrest: Temporary Water

  21. Lower Aldercrest: Moderate Movement

  22. Lower Aldercrest: New Tension Crack

  23. Lower Aldercrest: Side-Slope Shifting

  24. Lower Aldercrest: Detached Garage

  25. Lower Aldercrest: Unwanted Sunroom

  26. Lower Aldercrest: A New Entryway

  27. Lower Aldercrest: Minor Shifting

  28. Lower Aldercrest: Natural “Tea”

  29. Lower Aldercrest: Offset Curbing

  30. Lower Aldercrest: Lowered Basket

  31. Lower Aldercrest: Parallelogram Shift

  32. Lower Aldercrest: Hold-Out Resident

  33. Lower Aldercrest: Pressure Ridge

  34. Lower Aldercrest: New Scarp

  35. Lower Aldercrest: Halted Construction

  36. Lower Aldercrest: Lateral Shift

  37. Lower Aldercrest: Lateral Shift Detail

  38. Lower Aldercrest: Tension Cracks

  39. Lower Aldercrest: Makeshift Roadway

  40. Lower Aldercrest: Parallelogram #2

  41. Lower Aldercrest: First Floor Damage

  42. Lower Aldercrest: A Side View

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