SR 529 - NB Steamboat Slough Bridge - Painting - Complete December 2018

Contractor crews cleaned and painted the northbound State Route 529 Steamboat Slough Bridge between Everett and Marysville to help preserve the structure.

Why did WSDOT paint the northbound SR 529 Steamboat Slough Bridge?
Steel truss bridges need to be regularly cleaned and painted to preserve their integrity and keep them in good working condition. The northbound SR 529 Steamboat Slough Bridge was built in 1954 and last painted in 2002. Prior to the 2018 project, the paint was flaking and peeling away, exposing the steel to air and water, which resulted in rust and corrosion.

How was the work done?
Due to the bridge's size, work was done in sections. Contractor crews encased one section of the bridge with a containment system at a time to protect the surrounding areas from exposure to construction activities that included cleaning, painting, debris removal and cleanup.

The contractor then cleaned the bridge and removed the old paint by sandblasting it until the bare metal of the bridge was exposed. When that was complete, new primer and paint was applied. As sections were completed, crews moved to another area of the bridge and repeated the process.

Crews worked from platforms they installed below the bridge deck.

The end result is the bridge has a new coat of paint that will help prolong the life of the structure by protecting it from rust, corrosion and the birds that frequently nest on the bridge.

Project Benefits

  • Preservation: This work helps protect the bridge from corrosion while preserving the bridge's structural integrity.
  • Economic: Maintaining the bridge is more cost-efficient that replacing it. Maintained properly, the bridge will continue to keep up with the high demand of traffic for years to come.


Financial Data for PIN 152907D
Funding Source Amount ($ in thousands)

  • CWA $7,473
  • Total $7,473


Northwest Region Communications
15700 Dayton Ave. N.
Seattle, WA 98133