Text Size:   A+ A- A   •   Text Only
Site Image

U.S. 26: Glencoe Road Interchange Project

Project Summary:

The Oregon Department of Transportation, in partnership with Washington County and the City of North Plains, began construction in July 2012 on a project to improve safety and operations of the U.S. 26/Glencoe Road Interchange. Work was complete in October 2014. The 2009 Oregon Legislature allocated $32 million in the Jobs and Transportation Act (JTA) for this project.  

Project Summary

Latest News (Oct. 2014):

This project is complete. Thanks to all for you patience during construction.

Access change: left turns from the Arco gas station onto southbound Glencoe Road are no longer permitted. There is a left turn lane for southbound Glencoe Road traffic to enter the Arco gas station. 



Project Overview
ODOT (along with the City of North Plains and Washington County) previously developed a draft Interchange Area Management Plan (IAMP) for the U.S. 26/Glencoe Road interchange, which identified $80 to $90 million of interchange improvements.
The 2009 Oregon Legislature allocated $32 million in the Jobs and Transportation Act (JTA) to fund improvements to the interchange. ODOT worked with the city and county to develop a design concept that meets the $32 million budget provided. The project will prioritize safety and mobility improvements and strive to increase capacity for the most critical movements.
Project Elements:
  • Replacing the Glencoe Road bridge over U.S. 26 with a new, four-lane bridge (the bridge will be built wide enough to accommodate five lanes in the future)
  • Lengthening and widening the U.S. 26 westbound exit ramp
  • Replacing the culvert on Glencoe Road to the north of the interchange with a new structure
  • Improving pedestrian and bicycle connections on the new bridge over U.S. 26
  • Improving intersection components, including traffic signals, signing, striping, drainage and water quality

Glencoe Interchange
The existing two-lane Glencoe Road over-crossing lacks adequate shoulders, turn lanes, and bicycle/pedestrian accommodations.  The most significant safety issue is that the existing westbound off-ramp is not long enough to safely accommodate vehicles using the interchange, creating backups onto U.S. 26. 
In addition, the interchange cannot support the projected increase in traffic volumes, both from the adjacent City of North Plains and the larger regional vicinity, which includes the Cities of Hillsboro, Cornelius, and Forest Grove.  The interchange is an important access point from U.S. 26 to these cities.  The U.S. 26/Glencoe Road interchange modernization project is intendend to support economic development and mobility in the region.  This project is needed to support present and planned land use and industrial development in western Washington County. 

Traffic impacts and schedule

Work began in July 2012 and was complete October 2014.  No more traffic impacts are planned for this project.

Retaining Walls
As part of the project, ODOT constructed a retaining wall (approximately 450 feet long) along the westbound U.S. 26 off-ramp and a smaller retaining wall (approximately 160 feet long) that will be part of a new tributary bridge. These walls will be visible from a proposed future city trail.
There were three options for architectural treatments for these retaining walls. We invited community members to vote for which treatment they would prefer. The retaining wall treatment that received the most community votes is Oregon Basalt. This architectural treatment was incorporated into the design and construction of the Glencoe Road Interchange Project.  

Retaining Wall Treatment Options
Monterey Drystack
Oregon Basalt - WINNER 
Sandstone Ashlar

Project Maps/Graphics

Before & After Aerial Graphic 
Project Detail Map  
Construction Staging
(updated July 2012)

Detour Routes  
Tributary Bridge & Future Trail 
Project Timeline 

Jobs and Transportation Act (JTA)
The Oregon Jobs and Transportation Act (HB 2001) is the transportation funding plan approved by the 2009 Oregon Legislature.  Three core themes emerged from the legislation:
  • accountability, innovation and environmental stewardship;
  • highway, road and street funding; and
  • multimodal funding.
Additional provisions address important elements of Oregon's transportation system and our statewide economy.
The JTA identified 37 specific highway projects (plus funding for 12 local governments in eastern Oregon).  These projects and allocations total $960.3 million.  In ODOT Region 1 (Portland-Metro area), there are eight JTA projects, including the U.S. 26/Glencoe Road Interchange project. 
U.S. 26 Glencoe Road Interchange Area Management Plan
The U.S. 26 Glencoe Road Interchange Area Management Plan (IAMP) has been developed in conjunction with the U.S. 26: Glencoe Road Interchange Jobs and Transportation Act Project. The purpose of the IAMP is to protect the long-term function and safety of the interchange, and to minimize the need for future major interchange improvements. It is required by law for any new or significantly reconstructed interchange (OAR 734-051-0155.6). 
The Oregon Transportation Commission adopted the IAMP in December 2010 (please note that the file is large and may take several minutes to download).   
Next Steps

ODOT hosted public open houses on Sept. 23, 2010, June 9, 2011 and July 19, 2012. ODOT staff is available to attend local meetings to discuss this project.  Construction began July 2012.

To view archives of public involvement activities, click here

ODOT Contact Information
Lili Boicourt
ODOT Community Affairs Coordinator
123 NW Flanders
Portland, OR  97209