Cornforth Consultants
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      • Port Westward Power Plant Seismic Design
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Bonneville Dam Juvenile Fish Bypass

Cascade Locks, Oregon
Cornforth Consultants was retained by the Portland District Corps of Engineers to perform geotechnical explorations and prepare a Geotechnical Data Report for three potential alignments for the Juvenile Fish Bypass System that would utilize an existing Ice and Trash Sluiceway at the upstream intake and would discharge at the downstream tip of Cascade Island.

The preliminary project design involved the installation of large diameter in-water driller shafts to support the outfall structure. The purpose of the explorations was to determine the geotechnical properties of the subsurface materials for the preliminary design, and the initial geotechnical parameters for the construction of large diameter shafts. In addition, this work was used to evaluate the geotechnical properties for foundation design, evaluate the liquefaction potential during an earthquake, and establish design parameters. Field explorations were conducted at three potential site locations for the Corner Collector Outfall alignment.

All exploratory drilling work was conducted from a floating plant during the designated in-water work period with a Becker Drill that had the capability to convert to a core drill. The data was also utilized to analyze the factors of safety against liquefaction during the design earthquake, and locate potentially liquefiable zones and associated downdrag loads within the overburden materials. In-situ pressure meter testing established parameters for P-Y lateral load analysis. Other recommended preliminary pile design parameters included estimated capacities due to skin friction and end bearing, and uplift resistance available in pile rock sockets.

​Cornforth Consultants Inc. received an “Outstanding” performance evaluation for this project by the Portland District. In his letter of appreciation to our firm for this project, District Engineer Col. Randall J. Butler stated: “Your final product was of superior quality. We compliment you on your high degree of professionalism and very cooperative attitude.”
 
Type 2 RHRS Slope on Highway 26
Bonneville 2PH Fish Bypass Overwater Becker Drilling

​Services Provided:

  • Uplift Pressure Investigation
  • Earthquake Engineering
  • Fish Passage Geotechnical Design
  • Geologic Hazards​
  • Home
  • Services
    • Earth & Rockfill Dams
    • Reservoirs, Canals, and Levees
    • Spillway Safety Inspections
    • Landslides and Rockfall
    • Earthquake Engineering
    • Geologic Hazards
    • Geotechnical Site Characterization
    • Hydrogeology
    • Expert Witness
    • Concrete Dams and Locks
    • Geotechnical Instrumentation
    • Deep and Shallow Foundations
    • Geotechnical Manuals
  • Industries
    • Water Resources
    • Energy
    • Natural Resources
    • Industrial
    • Transportation
    • Ports and Airports
    • Expert Witness
  • Projects
    • Earth and Rockfill Dams >
      • Barney Reservoir
      • Frog Lake Reservoir
      • Iron Gate Dam Raise
      • McGuire Dam Raise
      • Bonneville Cofferdam
      • Bull Run No. 2 Seismic Stability Analysis
    • Levees and Canals >
      • Libby Dike Rehab.
      • St. Johns Dike Stabilization
      • Cowlitz River Levees
      • Swift Canal Failure
    • Earthquake Engineering >
      • Barney Dam Seismic Analysis
      • Fern Hill WTP Liquefacation Study
      • Bull Run No. 2 Seismic Stability Analysis
      • Mt. Tabor Seismic Stability Analysis
      • Port Westward Power Plant Seismic Design
    • Rock Slopes and Tunnels >
      • Libby Rockfall Mitigation
      • Sandy River Pipeline Tunnels
      • Ketchikan Third Avenue Extension
      • Sain Creek Water Supply Tunnel
      • Montana Rockfall Hazard Rating System
    • Foundations >
      • Port Westward Power Plant
      • Cascade Locks Casino
      • Air National Guard Hangar
      • Biglow Canyon Windfarm
      • Oakridge Water System Improvements
    • Concrete Dams and Locks >
      • John Day Lock & Dam
      • Marmot Dam Removal
      • The Dalles Dam
      • Willamette Falls Dam
      • Bonneville Dam
    • Transportation >
      • OTIA Cracked Bridge Geotechnical Baselines
      • Newburg Dundee Bypass Design DEIS
      • I-84 Sandy River Bridge Investigation
      • Tanana River Bridge Foundation, Tok, Alaska
      • Montana RHRS Implementation
      • Ketchikan Third Avenue Extension
    • Ports and Airports >
      • Navy CVN Drydock
      • Depoe Bay Seawall Distress
      • Willamette Falls Flow Control Structure
      • Air National Guard Hangar
    • Water and Wastewater >
      • Fern Hill Water Treatment Plant
      • Tualatin Valley North Transmission Line
      • Evaluation of 28 Water Storage Facilities
      • City of Sandy Water Treatment Plant
      • Mt. Tabor Reservoir No. 5 Cap Study
      • Oakridge Water System Improvements
  • Staff
  • Resources
  • Careers
    • Geotechnical Engineer
  • Contact Us