WSDOT improved the safety of 89 columns supporting 14 critical bridge ramps along I-5, and one bridge on SR-900 in Renton. Upgrades make the bridges safer for drivers, buses and pedestrians during earthquakes.
These retrofits bring the bridges up to current seismic standards. Some of the bridges carry the highest traffic volumes in the region, including:
- I-5/I-90 interchange
- I-5/Spokane Street interchange
- I-5/Albro/Swift/Corson/Michigan interchange
- SR 900/112th Ave. SE undercrossing
The retrofitted bridges are better able to withstand greater seismic stress caused by earthquakes, reducing the risk of collapse.
Crews strengthened the bridges with steel jackets and added catcher blocks to help keep girders affixed to bridge columns during and earthquake.
This project was part of WSDOT's seismic retrofit plan to strengthen more than 900 bridges statewide.
| Protects Environment
Crews used fencing and erosion control tools including silt fences and check dams to protect wetlands and soil erosion.
Partnerships & Cooperation
We appreciate the patience and cooperation of drivers while crews worked to improve the safety of the bridge ramps.
This project was funded through the following source:
- Pre-existing funds: $6.7 million
- Total funding from all sources: $6.7 million
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