ODOT is developing an Interchange Area Management Plan that will document traffic volumes and interchange performance to define a level of service — and to ensure that level will extend into the future with the State’s investment. The best set of improvements that can be constructed with available funding will move to final design and construction.
ODOT and the consultant team are considering many factors — such as safety, traffic flow, and short and long-term transportation needs — as they design the new interchange. They have narrowed down the design alternatives to two interchange concepts that minimize the footprint of a full interchange. Some private property would need to be acquired to construct the project.
The two concepts being analyzed are the Diverging Diamond Alternative and the Single Point Interchange Alternative. The following images of the concepts, as of March 2019, represent how ramps and roads connect to I-5. ODOT and the consultant team still need to explore the locations of County roads and private-property accesses by considering survey data, environmental data and traffic data, and by having conversations with owners of properties and businesses. A public open house to share the analysis of the two alternatives will be held in June.
Diverging Diamond Alternative
Single Point Alternative for the Aurora Interchange
Funding is not available for a full interchange. Only Phase 1 is funded for construction at this time. Phase 1 will be determined by summer 2019, with design refinement by fall 2019 and construction bidding in 2021.
For more information about the project, its scope, work progress to date and next steps, click these links:
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.
What Problem Will This
Approximately 32,000 vehicles use Exit 278 Aurora-Donald or travel past the ramps entering and exiting Interstate 5 along Marion County’s Ehlen Road. The volume of traffic, proximity of roads and access points, and visibility issues in the interchange area cause congestion and safety concerns.
This project will design and construct a set of improvements.
The interchange has a variety of users and complex factors to consider as design progresses. It was built about 60 years ago for a much lower traffic volume and has been over capacity at peak times for many years. It has significant safety issues and does not operate like a busy interchange should.
Reconstructing this interchange is a high priority of the Mid-Willamette Valley Area Transportation Commission, Marion County and ODOT.
Access for pedestrians, including those with disabilities, will be available and identified through or around work zones.
This can be made available in an alternate format on request by calling 503-373-7093 or via the Oregon Telecommunications Relay System: 7-1-1.
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