OR 43 and OR 99E Interchanges

Creating safer, more efficient interchanges for people who drive, walk, bike and roll. 

OR 43 Interchange Improvements

The project will remove the current I-205 northbound on-ramp from OR 43. Northbound traffic will instead use a roundabout to access northbound I-205.

Why a Roundabout?

A roundabout improves safety and operations compared to a signalized intersection. The table below shows traffic control options considered for the northbound I-205 on-ramp:

EVALUATION CRITERIA ROUNDABOUT SIGNAL
Interstate Access* from OR 43 Southbound
Interstate Access from OR 43 Northbound
Operations on OR 43
Safety
Access to/from Willamette Falls Drive
Compatibility with future improvements
Life-cycle cost savings

Ratings: = Positive = Neutral = Negative

*Proposed improvements include removal of the existing ramp meter and extension of the auxiliary lane to OR99E exit-ramp.

Source: A Safer Choice (FHWA-SA-08-006, a Roundabout Informational Guide)
https://safety.fhwa.dot.gov/intersection/innovative/roundabouts/fhwasa08006/fhwasa08006.pdf

Morning (AM) Peak Traffic Simulation

Afternoon (PM) Peak Traffic Simulation

Additional interchange improvements include:

  • Removing the current I-205 northbound on-ramp from OR 43 and replacing it with a roundabout to reduce crashes to and from OR 43.
  • Extending the OR 43 to I-205 northbound on-ramp across the Abernethy Bridge.
  • Removing the Broadway Street bridge overcrossing.
  • A new multi-use path along the riverside of OR 43 from the I-205 southbound exit ramp to the intersection with Willamette Falls Drive.
  • A new rapid flashing beacon and crosswalk to support people walking and bicycling across OR 43 to access Willamette Falls Drive and West A Street.
  • Improved connections with other area trails and paths.

OR 99E Improvements

  • Realigning or widening the on-and-off ramps at OR 99E.
  • A new multi-use path and a 6-foot-wide sidewalk connection with a new crossing on Clackamette Drive.
  • A new 8-foot-wide sidewalk connection between ramp terminals on OR 99E.
  • Improved connections with other area trails and paths.