North Creek Fish Passage

LOCATION

Everett, Washington

DESCRIPTION 

Northwest Construction, Inc. served as the general contractor for WSDOT on this project, overseeing the successful installation of a new box culvert and associated streambed work crossing SR 96, a five-lane roadway. The construction took place during the summer months of 2023.

SCOPE OF WORK 

This project involved the replacement of an existing 72” culvert with a 20-foot-wide box culvert on SR 96. Spanning across five lanes of traffic, much of the work required multiple extended road closures and night shifts. Our team excavated across SR 96 in two phases to maintain traffic flow.

A distinctive aspect of the project involved shoring one side of the culvert excavation to protect an existing live sewer line parallel to the culvert. Collaboratively, Northwest Construction, Inc. and Malcolm devised a shoring system, comprising cantilevered piles spaced every 8’4” across SR 96. During excavation, our team installed 8’x20’ steel sheets between the piles, serving as temporary lagging, which were removed during the culvert backfill process. Subsequently, piles were cut down two feet below the roadway surface and abandoned in place.

PROJECT HIGHLIGHTS

• Replaced 72” culvert with a 20-foot-wide box culvert
• Worked across five lanes of traffic on SR 96
• Required extended road closures and night shifts for majority of work
• Excavated across SR 96 in two phases to maintain traffic flow
• Managed major subcontractors responsible for drilling shoring piles and casting wing walls
• Negotiated additional access with property owners for staging and work access
• Successfully coordinated with utility owner to shut down power during construction stages
• Designed and implemented a shoring system to protect live sewer line parallel to the culvert
• Shoring system consisted of cantilevered piles every 8’4” across SR 96
• Organized off-site yard for staging deliveries, hired third-party trucking company, and rescheduled subcontractors