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Interchange Design
About Us
The Interchange Engineering staff provides statewide guidance concerning interchanges layouts, interchange design, and Interchange Modification Requests.  Responsibilities include developing interchange design standards, administering the Standard Interchange Layout Sheet, and processing Interchange Modification Requests on the Interstate System required by the Federal Highway Administration.
Kent Belleque
Senior Interchange Engineer
(503) 986-3536
Dave Warrick
Interchange Engineer
(503) 986-3560

Interchange Modification Requests (IMR)
Roadway Engineering submits formal requests to the Federal Highway Administration (FHWA) regarding modifications or additions to the Interstate System.
Link to FHWA Policy on Interchange Modification Requests:

Layout Sheets
Interchange Layout Sheets are required for all new or revised interchanges.  Roadway Engineering is responsible for preparing or overseeing the preparation of the Interchange Layout Sheet. 

Procedures for Layout Sheets
Procedures for the preparation of the interchange layout sheets are linked under "Resources" below.

IMR's In Progress
Kuebler Blvd. SB Ramps (JTA Project) 

Roadway Engineering has developed an Interchange Design Class.  The content of that training is currently being updated.  Please check the HR website for scheduled sessions.  Technical Support is available by contacting one of the Interchange Engineers. 

Interchange Photographs
For interested parties, we have created a sample photo gallery of Interchange Designs in Oregon.


FHWA Policy on Interchanges
Highway Design Manual
Interchange Design Class  (when available through HR) 
Interchange Layout Sheet Guide 
Interchange Layout Sheets Typical (dgn)    


Traffic Diagram Example (dgn)

Layout Cell Library (cel)

Gray Shade Table (tbl)