The web Browser you are currently using is unsupported, and some features of this site may not work as intended. Please update to a modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has to offer.
The MDOT load rating program is administered by the Bridge Load Rating Unit. The program is responsible for ensuring that all bridges are load rated to verify their safe load carrying capacity in accordance with the National Bridge Inspection Standards (NBIS). The Bridge Load Rating Unit performs load capacity evaluations of complex bridges, truss bridges, movable bridges, and all other structures within the state-owned inventory. The area also serves as the technical consultant to FHWA, MDOT Divisions, regions, and local agencies, and is responsible for assisting in FHWA NBIS Metric evaluations.
Guides and Manuals
AASHTOWare Bridge Rating (BrR)
2009 Interim MDOT Bridge Analysis Guide - Revised Sections
(Note: The Revised Section contains only those sections that were modified in the 2009 Interim Update.)