Landslide Technology
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Prospect 2 Penstock Rockfall Mitigation

Prospect, Oregon
Powerhouse and Rockfall Protection Measures Powerhouse and Rockfall Protection Measures
PacifiCorp Energy's Prospect 2 Penstock is comprised of two, side-by-side, 6.5-foot O.D. pipes.  The penstock is roughly 850 feet long with an elevation drop of 484 feet.  The facility was constructed in 1927.  Early photographs of the site prior to penstock construction show a completely cleared slope with no vegetation. The slopes are steep (nearly vertical) near the top and flattens as it nears the powerhouse.  Overall, the slopes are bowl-shaped with the penstocks located in the center.  The drawback to this arrangement is that rockfall from the surrounding slopes is funneled towards the penstock powerhouse below.

The initial upslope inspection revealed the presence of a failing 125-foot long, tied back, timber crib wall aligned roughly perpendicular to the penstock.  The wall was in such a secluded location that its existence had passed from the knowledge base of current employees.  The wall was extremely deteriorated and there was a reasonable concern that it could completely fail releasing a large quantity of rock backfill. If this occured, it would likely damage to the penstock and possibly the powerhouse.

Following the reconnaissance, LT recommended removal of the actively failing timber crib wall. To do this without damage to the facility required construction of two Brugg rockfall fences and suspending two draped mesh curtains followed by slope scaling and careful demolition of the timber crib wall. This approach allowed the timber wall to be removed and prevented any damage to the powerhouse, transformers, or penstocks occurring due to rockfall.


Services Provided:

  • Rock Slope Investigations
  • Rockfall Mitigation
  • Rock Slope Hazard Assessment
  • Emergency Response
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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