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.
Phase 1A addressed some of these issues. Learn more about these improvements and how we got to our current design by visiting the Phase 1A webpage.
Phase 2 constructs the full diverging diamond interchange. This addresses the capacity issues by building an interchange that will work for years to come.
To do this we will:
Replace the I-5 bridges over Ehlen Road NE with one new bridge.
Reconstruct the I-5 travel lanes to match the new I-5 bridge.
Change the section of Ehlen Road NE under the I-5 bridge to have two lanes of traffic in both directions and new accesses to the I-5 on and off-ramps.
Lengthen and widen the southbound off-ramp, the southbound on-ramp and the northbound on-ramp – completely upgrading all freeway ramps.
Relocate the Dolores Way and Ehlen Road NE intersection to the east.
There’s a similar diverging diamond interchange in Nevada. You can watch this video about it to get an idea of what the interchange we’re designing may look like.
Estimated construction: 2024-2027
Aurora-Donald Interchange, Exit 278
Cost and Funding
Total estimated cost to construct: $62.5 million