SR 529 over Steamboat Slough
Snohomish County, Washington · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 529 over Steamboat Slough in Snohomish County, Washington, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1927 and reconstructed in 2003, making it 98 years old at the 2025 inventory.
- It carries about 16,592 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (48.03485, -122.18274)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 4 | Poor condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Steel movable swing |
| Length | about 853 ft |
| Location | 6.2 N Jct SR 529 Spur |
| NBI structure number | 0000965C0000000 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.
All bridges nearby: Snohomish County, WA bridge conditions · Washington bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.