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Possible online services disruption due to Internet related outage

A worldwide technology outage is causing disruption to some State of Illinois online systems.  We are aware of this issue and are diligently working on restoration.

Agency Alert

Welcome to the new IDOT home page.  Our location has changed, please update any bookmarks.

Historic Bridges

IDOT partners with the Illinois State Archaeological Survey (ISAS) to maintain Historic Bridge Survey inventories to maintain an inventory of the State's Historic Bridges, which are at least fifty years old and of historical significance. 

IDOT Guidance for Photographing Historic Structures