We removed the existing pipe culvert at Cougar Creek on SR 531 near Arlington and replaced it with a concrete box culvert. The existing culvert collapsed in October 2008, causing a sinkhole in the roadway. Crews temporarily repaired the culvert by pushing a 24-inch diameter pipe through the existing culvert pipe. View video of the collapsed culvert before the temporary repair last fall.
In September and October 2009, crews removed the damaged culvert, replaced it with a concrete box culvert, and rebuilt the roadway above the culvert.
The new culvert will help stabilize the roadway and protect against future storms. It will also improve fish passage on Cougar Creek.
The new culvert is 16 feet wide, 10 feet tall and 74 feet long. By comparison, the existing pipe culvert is just 30 inches in diameter. The new culvert was designed for the 100-year flood and will be able to carry higher volumes of water - up to 32.5 cubic feet per second.
The new culvert will stabilize the road and protect against future storm damage.
| Protects Environment
The new culvert will improve fish passage on Cougar Creek.
Partnerships & Cooperation
We awarded the contract for this project to Tri-State Construction in May 2009. We began construction in Septmber 2009 and wrapped up work in October.
This project is funded through the following fund sources:
- Existing state funds - $2.4 million
- Total funding available - $2.4 million
WSDOT Project Engineer
Phone: (425) 814-7104
Meghan Soptich Pembroke
Phone: (206) 440-4704
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