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Allen and Denney Ramp Changes

New Frontage Road Reduces Merging Conflicts

The interchanges at SW Allen Boulevard and SW Denney Road are some of the worst congestion locations on OR 217. The two interchanges are very closely spaced, leading to merging conflicts and crashes.  

Map showing new frontage road to west of highway and two ramps closed. We are permanently closing two ramps in the southbound direction (the SW Allen Boulevard on-ramp and the SW Denney Road off-ramp) and building a new two-lane, one-way (southbound only) frontage road adjacent to the highway. The frontage road will work similarly to the one to the north connecting Canyon Road and Beaverton-Hillsdale Highway. This change will reduce the amount of merging and in turn increase safety and reliability in the southbound direction.

The new frontage road will allow drivers to travel south more safely from SW Allen Boulevard to SW Denney Road, bypassing OR 217 entirely. It will also include a new bridge over Fanno Creek.

We will widen both the SW Allen Boulevard off-ramp and the SW Denney Road on-ramp to accommodate the increased traffic on those two ramps.

  • ACTIVE CONSTRUCTION: The OR 217 southbound Denney Road off-ramp and on-ramp are closed for approximately five months starting at the end of April to allow crews to finish the frontage road and ramp widening work in this area. 
    • Detour for the Denney Road southbound off-ramp: continue south to the Hall Boulevard off-ramp (exit 4A) and use the Scholls Ferry Road on-ramp to get onto northbound OR 217 and return to Denney Road.
    • Detour for the Denney Road southbound on-ramp: use the Denney Road on-ramp to head north, exit at Allen Boulevard (exit 2B) and then take the Allen Boulevard on-ramp to go south on OR 217.
    • After the 5-month ramp closure period, the Denney Road southbound off-ramp from OR 217 will be part of the new frontage road between Allen Boulevard and Denney Road. It will no longer serve as an off-ramp from the highway. At that time, the Denney Road southbound on-ramp will reopen and the new frontage road will open.
    • Check before you leave for up-to-date traffic impacts.

Denney Road on-ramp and off-ramp detour maps

Using the New Frontage Road

  • Those who normally get on OR 217 using the SW Allen Boulevard southbound on-ramp will use the new frontage road to travel south and merge onto the highway via the SW Denney Road southbound on-ramp.

  • Those who normally get off OR 217 using the SW Denney Road southbound off-ramp will exit the highway at SW Allen Boulevard and use the new frontage road to travel south to SW Denney Road.

Rendering of New Frontage Road

Cross section. The are shoulders on both sides and two travel lanes southbound.

Southbound frontage road between SW Allen Boulevard and SW Denney Road.

Project Contacts

OR 217 Auxiliary Lanes Project Team 
Lili Boicourt

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Project Documents

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