Illinois Department of Transportation, Erica Borggren, Acting Secretary
Patrick J. Quinn, Governor
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NBIS and Bridge Inspection Information


Section 3 of the Structural Services Manual provides documentation of the official bridge inspection policies for the State of Illinois. Below are references and links to aid in following those policies.

Class Announcements

Illinois Bridge Inspectors

Bridge Information


Bridge Office Forms

FHWA Resources

Bureau of Local Roads Circular Letters

June 28, 2012 GoToMeeting Webinar
Calculating Section Loss in Steel Members

This webinar is intended to provide an introduction to section loss calculations on steel bridge members for NBIS inspectors. The methods covered are those preferred by IDOT for use with the Structure Information and Procedure Manual in determining NBI ratings as well as to gather information for rating analysis calculations on damaged structures. The topics covered include critical areas to inspect, taking measurements, documentation of findings and calculation of section loss. Example section loss calculations are reviewed. This webinar is approximately 85 minutes.

Please click here to download the webinar video.

Please click here to download the PDF handout from the course

The GoToMeeting codec is required to play the .wmv file in Windows Media Player. Click here to download the GoToMeeting codec.


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