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Sellwood Bridge

  • Chemeketa Center for Business and Industry 626 High Street Northeast Salem, OR, 97301 United States (map)

Please RSVP by 12:00 pm Friday, November 11th

ASCE Capital Branch
November Technical Presentation and Luncheon

Date:              Thursday, November 17th, 2016

Location:        CCBI Room 115, 626 High Street NE, Salem, OR 97301                     

Time:              12:00 pm to 1:30 pm

Cost:              $15 Professionals, $5 Students

Topic:             Sellwood Bridge

RSVP:  Please RSVP by 12:00 pm Friday, November 11th.  To RSVP, CLICK HERE.  The new window that opens up will allow you to register and indicate your preference for paying for the event.  You can choose to either pay with a credit card at the time you register or indicate that you will pay at the door (cash only).  Please note that all payments are non-refundable after the RSVP cut-off time.  While the preferred registration method is clicking the link, we can also accept your RSVP via email at or by calling Erik McCarthy at (503) 485-5490.

Background:  Multnomah County, Oregon is replacing the Sellwood Bridge within its existing footprint.  The original bridge was built in 1925 at the site of an ancient landslide located along the west bank of the Willamette River.  The landslide, approximately 800 feet long, 500 feet wide, and 50 feet deep, has moved in excess of three feet toward the river channel during the bridge’s 90-year history, which caused severe buckling and cracking of the old bridge deck and abutment piers. The landslide movement was mitigated using an anchored shear pile (ASP) system.  Structural mitigation of landslides is increasingly necessary where existing geologic hazards intersect with displacement-sensitive infrastructure. Anchored shear piles (ASP) can be used to develop full-depth restraint of large landslide masses with limited post-construction deformation.  This presentation highlights a case study for landslide mitigation through the use of high-capacity ground anchors integral with cast-in-place concrete shear piles.  Construction of an ASP system can provide full-depth resisting force to a landslide, without the risk and right-of-way impacts of large open-cut excavations. 

Guest Speaker Biography 

Tom Westover has worked as an Associate Engineer for Cornforth Consultants, Inc. since 2007.  He holds a Master’s degree in Geotechnical Engineering from the University of Minnesota, and is a registered Professional Engineer in Oregon, Washington, Alaska, and Idaho.  His areas of professional expertise includes design and testing of high-capacity ground anchors, soil-structure interactions, anchored shear pile design, geotechnical engineering for transportation applications, landslide evaluations, rockfall mitigation and design, 3D modeling and visualization, in-situ stress determination, construction sequencing on landslides, and evaluation of constructability.  Mr. Westover has worked on numerous complex geotechnical projects including: Sellwood Bridge Landslide Mitigation, Washington Park Reservoir Improvements, The Dalles Dam Spillwall, Soda Springs Dam Fish Passage, Iowa Street Viaduct Replacement, Klondike Highway RCC Bridge Replacement, Yale Powerhouse Rock Block Mitigation, Willamette Falls Dam Flow Control Structure, and the Historic Columbia River Highway Trail.  

Earlier Event: October 20
Spirit Lake Tunnel Repair
Later Event: December 15
Karlson Island Tidal Restoration Project