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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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Bridge Scour Analysis Statewide Louisiana

| View Projects: Statewide, LA

  • Client:

    Louisiana Department of Transportation and Development
  • Service:

    Highways & Other
  • Status:

    Completed
  • Overview

    News headlines in New York on April 6, 1987 carried the tragic news: ten people had lost their lives the day before in one of the most catastrophic occurrences of bridge failures in the United States. What caused the collapse of the Interstate 90 Bridge crossing of Schoharie Creek near Amsterdam, New York did not come as a total surprise to bridge engineers. It was the same condition that led to more than half the bridge failures in the United States annually: scour.

    Hence, the FHWA issued Technical Advisory T5140.23, which required all State Departments of Transportation (DOTs) to evaluate existing bridges for potential failure due to scour or stream instability. The FHWA advisory further required all DOTs to develop Plans of Action for implementing countermeasures for those vulnerable bridges. The Louisiana Department of Transportation and Development (LADOTD) divided the state into multi-regional areas for multi-consultants to perform the initial scour assessment. Based on our impressive list of qualifications, Modjeski and Masters was selected by LADOTD to help them meet the requirements of the technical advisory.

    Modjeski and Masters assembled a multi-disciplinary team with the capability and capacity to perform scour analyses on 648 bridges throughout the state that were determined to be scour critical. The LADOTD’s scope of work also included determining a Plan of Action for the scour critical bridges, as well as a design of countermeasures and associated construction plans, if necessary. The significance of the assignment cannot be understated. For the LADOTD, compliance with FHWA directives is a must. For Modjeski and Masters, this is an extremely important multi-year assignment. It’s one for which our client has total faith in our team’s ability to use our engineering expertise to assure the safety of the traveling public in their jurisdiction.

    Modjeski and Masters has been an active partner in the Louisiana’s bridge program for generations. In addition to this more recent scour assignment, our portfolio of successful projects includes:
    • Design of the combined rail/auto Huey P. Long Bridge over the Mississippi River in the 1920s,
    • Design studies for the New Orleans expressways in the 1940s,
    • Design of the world’s 5th longest highway cantilever bridge, in the 1950’s, over the Mississippi River in New Orleans, and
    • Design of other major river crossings at I-10 Baton Rouge, LA 1 Simmesport, I-310 Luling and US90B Crescent City Connection No. 2.
    Throughout the decades, the faith and trust the Louisiana transportation agencies has placed in Modjeski and Masters has been reaffirmed.
  • Description

    Tasks Performed
    • Scour Analysis

    Bridge Geometry
    • Length of Main Span – n/a
    • Total Project Length – n/a
    • Lanes on Structure – n/a
  • Testimonial

    Modjeski and Masters assembled a multi-disciplinary team with the capability and capacity to perform scour analyses on 648 bridges throughout the state that were determined to be scour critical.
  • Credits

    Zolan Prucz, PhD, PE (Principal In Charge)
    Donald F. Sorgenfrei, PE (Project Manager)
    William B. Conway, PE (Supervising Engineer)

    Photograph courtesy of Mike DelGaudio