- This project will be advertised for competitive bid in December.
- We expect to begin construction in spring 2013.
Why is WSDOT
improving drainage beneath the ramp from northbound SR 167 to northbound I-405?
Culverts beneath the ramp from northbound SR 167 to northbound I-405 carry water runoff from the roadway and surrounding areas. Unfortunately these culverts, which have been in place for nearly 30 years, are deteriorating. The corrugated metal pipes are corroded, allowing water to seep in under the roadway and causing the material beneath the highway and median to settle. WSDOT repairs and maintains the culverts, but they have reached the end of their lifespan and need to be replaced to preserve the roadway.
The End Result
We will replace the damaged culvert with a new pipe made of thick, heavy, rubberized plastic. We will also move the location of the culvert beneath the shoulder of the ramp so maintenance crews can more easily access it for regular cleaning and maintenance work.
To accomplish this, crews will need to open up the ramp, remove the old culvert and install new pipe. This will require closing the ramp from northbound SR 167 to northbound I-405 for two full weekends during the summer of 2013. Detours will be in place during the closures.
- Replacing the culverts will prevent settlement underneath the highway.
- New culverts will provide proper drainage for roadway water runoff.
- The new culverts will reduce annual maintenance costs.
What is the project timeline?
- Fall 2012 - The project is being designed
- Dec. 17, 2012 - We will advertise the project for competitive bid
- February 2013 - We expect to award the construction contract
- Summer 2013 - We will start construction
- Fall 2013 - We will complete construction
Project signage will reflect the cost of construction engineering, project bid award and sales tax.
How can I get more information?
Gary L. McKee
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