WSDOT made safety repairs to the drainage system underneath the eastbound lanes of I-90 at the west portal to the Mercer Island lid.
This project was necessary to capture water that was flowing beneath the roadway, washing away base material from underneath the pavement and seeping up through cracks in the concrete panels. This caused a loss of support to the concrete roadway.
The new drainage system will direct the subsurface water away from the base of the roadway, which will preserve the integrity of the concrete panels and improve safety.
Partnerships & Cooperation
WSDOT awarded the contract to Award Construction, Inc. in June 2010. Construction took place in August 2010.
Pre-existing funds: $1.1 million
WSDOT Project Engineer
back to top