Montana Department of Transportation

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MDT Bridge Load Rating

image of a steel truss bridge located approximately 3 miles west of Divide, MT
A steel truss bridge located approximately 3 miles west of Divide, MT.

Load Rating – What is it and why is it important?

Load rating provides information about a specific bridge's load carrying capacity, which plays a key role in the Bridge Bureau's mission to maintain a safe, resilient, economical and reliable transportation system. This information, provided in a standardized and organized report, is used for several purposes:

  • To protect safety of the traveling public by identifying bridges with limited capacities and determining safe posting limits
  • To help in the prioritization of rehabilitation or replacement projects
  • To assist in overweight vehicle permit review
  • To satisfy federal requirements that all bridges in the National Bridge Inventory (NBI) must be load rated and restricted, if necessary