Bridge Inspection Program and MiBridge System - 591-0169-19

Desciption of Agency

The Michigan Department of Transportation’s (MDOT’s) Bureau of Bridges and Structures (BOBS) is responsible for administering the State’s bridge inspection program in compliance with National Bridge Inspection Standards (NBIS) for highway bridges longer than 20 feet that are located on public roads. The bridge inspection program is critical to ensuring the safety of Michigan highway bridges, identifying repair and maintenance needs, and determining the appropriate allocation of MDOT bridge funds. BOBS is responsible for establishing procedures related to bridge inspections, load rating calculations, quality control, and quality assurance. As of May 31, 2019, MDOT and 329 bridge owners were responsible for 11,186 bridges.

MiBridge is MDOT’s primary system for maintaining bridge-related data, including plan drawings, inspection reports, load ratings, and critical findings. MiBridge is used by bridge inspectors and bridge management personnel to maintain the bridge inventory and by local agencies, consultants, and the public to determine the condition of Michigan bridges.

Audit Objectives

  1. To assess the effectiveness of MDOT’s efforts to administer its quality control and quality assurance program over bridge inspections and load ratings.
  2. To assess MDOT’s compliance with selected federal and State requirements for its bridge inspection program.
  3. To assess the effectiveness of selected MiBridge access, backup, and application controls.


Estimated Release Date: January 28, 2021

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