‎Highlighted Project:‎ ‎ ‎ ‎ ‎ ‎‎ I-84: Moffett Creek Westbound Bridge

Details

County: Multnomah

Nearest City: Bonneville

Milepoints: 38.98

Estimated Cost Range: $30 - 50M

Anticipated Construction Years: 2029 - 2031

Project Description

Located between Bonneville and Warrendale in the Columbia River Gorge, the Interstate 84 Moffett Creek westbound bridge deck and structure is not seismically resilient. The bridge deck has signs of wear, ruts, exposed rebar and damaged concrete.

I-84 is a major east-west route across Oregon for freight. A bridge failure on I-84 would close this extremely important route for an extended duration, leading to significant bottlenecks on alternative routes.

ODOT will remove and replace the existing structure over Moffett Creek. The new seismically resilient bridge structure will have wider shoulders, and be built with reinforced earthquake-ready materials. The new bridge foundation will have large, reinforced concrete drilled shafts socketed deep into bedrock. Drilled shafts, crossbeams, bearings and superstructure will be designed, detailed and reinforced to meet current seismic standards.

Expected Outcome

Once constructed, system users will observe an improved bridge deck with a smoother travel surface, fresh striping and new guardrails. A wider shoulder will provide space for cyclists and emergency use. Drainage improvements will help prevent water from collecting on the road surface.

State of Good Repair

Improve overall smoothness and drivability of the road's surface.

When this project is complete, motorists and cyclists will have an improved travel surface on both the east and west travel lanes on I-84.

Increased durability and resistance for the bridge.

A stronger more resilient foundation and reinforcement earthquake-ready materials will result in a more durable structure ready to handle the weather systems and traffic volumes that regularly occur in this area.

Extend the life of critical infrastructure.

New weathering steel (corrosion-resistant) girders, deck protection systems (such as epoxy-coated or corrosion-resistant steel reinforcement) and modern expansion joints will maximize the design life and years in service of the structure while minimizing maintenance costs.

Safety

Improved user safety.

Fresh pavement will provide a smooth ride and fresh striping will help drivers see and stay in their lane. Drainage improvements will help drivers maintain control during heavy precipitation by preventing water from pooling on the road.

Increased space.

Emergency and disabled vehicles will have additional space to safely pull over with the addition of wider shoulders.

Mobility

Reliable freight routes.

Replacing this structure keeps connections reliable, allowing freight haulers to keep goods and services moving through Oregon.

Climate

Enhanced seismic resiliency.

The new structure will be designed, built, and reinforced to meet current seismic standards, helping maintain the connectivity of this critical route should a large earthquake occur.