Duvall Slough Bridge #1136B (NE Woodinville-Duvall Road) Re-Deck Project

Overview

The Duvall Slough Bridge is located on NE Woodinville-Duvall Road, east of West Snoqualmie Valley Road. King County will remove the top half-inch of worn-out concrete on the bridge deck and replace it with one-and-a-half inches of new concrete. The project also rebuilds both bridge approaches and repairs two bridge expansion joints. This work will protect and extend the life of the bridge for 30 years or longer.

This project goes to construction in summer 2024. The work requires a five-week-long road construction closure on NE Woodinville-Duvall Road between State Route 203 (Main Street/Carnation-Duvall Road) and West Snoqualmie Valley Road. The road must be closed because the bridge is too narrow to keep a lane open and maintain a safe work area. In addition, there cannot be any vibration from traffic when crews repave the concrete or work on the expansion joints.

A signed detour will be provided. The 7-mile-long detour could add an extra 15 minutes of travel time. We understand this is an inconvenience, please consider planning ahead.

Why this project is needed

More than 10,000 vehicles cross the Duvall Slough Bridge on NE Woodinville-Duvall Road every day. Crews have temporarily closed the bridge to repair potholes and patch up cracked concrete many times over the years. The concrete driving surface is now too damaged to rely on short-term repairs. Overlaying the concrete bridge deck, rebuilding the bridge approaches and improving the bridge expansion joints are critical to keeping this vital east-west corridor open to traffic for years to come.

What caused the bridge deck damage?

The 75-year-old concrete deck is cracked, prone to large potholes, and is nearly worn down to the steel rebar in some places. Water seeping through the cracks and thinning concrete continues to make the damage worse.

Why do the expansion joints need to be repaired?

The old expansion joints no longer allow the concrete to expand and contract like it needs to. Repairing the expansion joints will helps prevent cracking by allowing the new concrete re-deck to expand and contract like it should.

Project location

The project is located on NE Woodinville-Duvall Road between West Snoqualmie Valley Road NE and West Snoqualmie River Road NE. Larger view PDF 168KB

Five-week traffic detour during construction

NE Woodinville-Duvall Road is among the most heavily used east-west routes in King County. Crews must close the bridge to all traffic, including emergency response vehicles, to have enough room for a safe work zone. The seven-mile-long detour could add an extra 15 minutes to your trip. Travelers should add plenty of extra travel time through the area when this project is under construction.

Larger view PDF 211KB

Budget and funding sources

The preliminary estimated total project cost is $1.9 million. This project is funded by Federal grants.

Project timeline

• November 2023 – Advertise to contractors
• Summer 2024 – Construction
• August 2024 – Project complete