November 12, 2019:
- 7:00 p.m. Presentation at Aurora City Council at 21420 Main Street in Aurora.
- 8:00 p.m. Presentation at Donald City Council at 10710 Main Street NE in Donald.
November 13, 2019:
North Marion High School Commons, 20167 Grim Road NE, Aurora, OR 97002
- 4:00-5:30 p.m. Business and Stakeholder Engagement Group meeting.
- 6:00-8:00 p.m. Public Open House. Stop by and review the recommended future full interchange design with refined road connections, as well as the recommendations for Phase 1 improvements.
We are developing an Interchange Area Management Plan (IAMP) that will document traffic volumes and interchange performance to define a level of service and to ensure that level will extend into the future.
Design of the Interchange
We are considering many factors such as safety, traffic flow, short and long-term transportation needs as we design the new interchange. During the development process, the design has been narrowed to a concept that minimizes the footprint of a full interchange. However, some private property may need to be acquired to construct the project.
Diverging Diamond Alternative
Click to enlarge diagram
The preferred design is called a Diverging Diamond. The concept image represents how ramps and roads connect to I-5. We are still exploring the locations of county roads and private-property accesses. Considerations include survey, environmental and traffic data, and conversations with property and business owners.
Reconstructing this interchange is a high priority of the Mid-Willamette Valley Area Transportation Commission, Marion County and ODOT.
Approximately 32,000 vehicles use Exit 278 Aurora-Donald or travel past the ramps entering and exiting I-5. The volume of traffic, proximity of roads and access points, and visibility issues cause congestion and safety concerns around the interchange. Built about 60 years ago for a much lower traffic volume, the interchange has been over capacity at peak times for many years.
It has significant safety issues and does not operate like a busy interchange should. Phase 1 construction will make improvements to the interchange and address some of the current issues.
Phase 1 Design 2020
Construction in 2022 (Bid Let 2021)
Aurora - Donald Interchange (Exit 278)
Cost and Funding
The project was originally funded at $3.4 million. The Keep Oregon Moving transportation funding package, HB 2017, allocated nearly $25 million more for a total of $28.3 million to complete planning for the full interchange and design, and for construction of Phase 1.
$18 million will be used to construct Phase 1 improvements. Funding is not available for construction of a full interchange.