The Steamboat Slough Bridge was built in 1927 and rebuilt in 2003. This bridge is one of four operating swing spans remaining in Washington and it was the last of its kind to be built in the state.
The bridge started life in 1927 as part of US 99 with a single lane in each direction and 2,500 vehicle trips per day. In 1954, an additional bridge was built across Steamboat Slough providing two lanes for north and southbound traffic. In 1971, the Washington State Legislature renamed US 99 to State Route 529. Today the Steamboat Slough Bridge carries 32,000 vehicles a day.
The purpose of this project is to protect the bridge from corrosion damage with a new coat of paint and maximize its useful life.
This is one in a series of projects scheduled to help preserve bridges along the SR 529 and I-5 corridor between Everett and Marysville:
I-5 Snohomish River Bridge painting, scheduled completion summer 2024
I-5 - NB Marine View Drive to SR 529 - Corridor and Interchange Improvements, scheduled completion fall 2025
Projects planned for 2025 or later
This project, SR 529/SB Steamboat Slough Bridge - Bridge Painting
SR 529/Union Slough & NB Steamboat Slough Bridges - Scour & Bridge Rehab
I-5/SB Ebey Slough/SR 529/Railroad Bridge - Pier Column Repair (tentatively scheduled 2025-2026)
I-5/Steamboat Slough Bridge - Special Bridge Repair
I-5/SB Ebey Slough Bridge – Painting
SR 529/Snohomish River Bridge - Special Bridge Repair & Painting
$11.4 million from Pre-Existing Funds (PEF).
Bridge painting projects are complex efforts. This graphic shows many of the elements that may be needed to perform bridge painting.
The SR 529 Steamboat Slough Bridge was last painted in 2003 and is due for a fresh coat of paint.
