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Life-Cycle Engineering Services | EXPANDED

Modjeski and Masters is pleased to announce the acquisition of structural engineering firm Summit Engineering Group, Inc. Our combined engineering prowess and respective technical skillsets will enable us to provide streamlined design and construction solutions to best meet client needs.

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Rehabilitation of the I-5 Lift Bridges

| View Projects:USA Portland, OR

  • Client:

    Oregon Department of Transportation
  • Service:

    Field Services
  • Status:

  • Overview

    Maintaining a “well-oiled” machine requires more than just oil. It requires proper balance, precision, and alignment of all moving parts. This is especially true if the machinery is relied upon by the general public. Such equipment is currently used to raise and lower the twin lift spans of Oregon’s I-5 bridges over the Columbia River. When the lift mechanisms started showing signs of growing misalignment, ODOT needed someone who understood the complexity of the problem and could investigate. Wiss Janey Elstner, ODOT’s general engineering consultant, called on the familiar and trusted experts of Modjeski and Masters.
    Modjeski and Masters’ mechanical engineers started by conducting a detailed inspection of machinery components for both the Northbound and Southbound lift spans. Next, our bridge instrumentation and testing team strategically installed strain gages; an effective measure that Modjeski and Masters frequently employs to help trouble-shoot and test ailing bridges. Using the latest technical and rope access methods, our knowledgeable staff performed a detailed study without stopping traffic flow, an added value appreciated by both ODOT and the users of the busy I-5 Interstate Bridges. Working closely with all parties involved, our problem solvers were able to identify the origin of the mechanical troubles and develop conceptual repair details.
    Recent stakeholder development plans call for the future replacement of the I-5 Interstate Bridges. But concerns over environmental impacts have slowed the planned project. In the meantime, ODOT can rest easy thanks to the efforts of Modjeski and Masters. When implemented, our repairs will extend the life of the mammoth lift spans. Helping maintain great bridges – it’s part of our reputation.
  • Description

    Tasks Performed
    • Mechanical Inspection
    • Rehabilitation – Conceptual Design
    • Instrumentation & Testing
    • Strain Gauge Evaluation

    Bridge Geometry
    • Lift Span Length – 275 feet
    • Lift Span Vertical Clearance – 176 feet
    • Total Length – 3538 feet
    • Longest truss span (fixed) – 531 feet
  • Testimonial

    “On behalf of WJE, I would like to thank M&M for their hard work and professionalism in working with Brian and me during the instrumentation and inspection work. I believe the client was impressed by both the company’s knowledge and efforts.” Jonathan McGormley, Project Manager, WJE
  • Credits

    Leon K. Huang, PE (Principal In Charge)
    Jeffrey W. Newman, PE (Project Manager)
    David M. Barrett, PE (Instrumentation & Testing Leader)
    Lee R. Lentz, PE (Project Engineer)
    Elizabeth A. Sample, PE (Project Engineer)
    Geoffrey L. Forest, PE (Project Engineer)