Montana Department of Transportation

Malcolm “Mack” Long, Director

COVID-19

View the Governor’s Coronavirus Task Force site for more information.

MDT Bridge Load Rating

Image of a a steel girder bridge in Fort Benton, MT, with a scenic view of the Missouri River Breaks
Steel girder bridge in Fort Benton, MT with a scenic view of the Missouri River Breaks.

Manuals and Guidance

Please contact for any questions, comments, or other feedback regarding current, interim or additional guidance.

Current Manual

Title Version Release Date Archived Versions
MDT Bridge Inspection and Rating Manual 1.1 October 2018

Interim Guidance

Title Version Release Date Archived Versions Revision to Current Manual Section
(if applicable)
Load Rating of Timber Bridges 1.1 12/11/2019 zipped file
(right-click and save file to computer)		 8.2.6.3
New Bridge Asset Process 1.0 07/11/2019 n/a
Hands-on Inspection of Steel Members 1.0 07/01/2019 n/a
Load Posting Procedures 1.0 02/03/2020 8.4

Additional Guidance

The following is intended to address frequently asked questions by communicating current MDT practices, and providing clarification or additional guidance until it is incorporated in interim guidance or manual update.

Department Memos