SR 432 over Solo Slough

Cowlitz County, Washington · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

• SR 432 over Solo Slough in Cowlitz County, Washington, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
• It was built in 1961, making it 64 years old at the 2025 inventory.
• It carries about 6,580 vehicles a day (traffic count year 2023).
• Its listed owner is the state highway agency.
• It is one of 75 of the 161 inventoried bridges in Cowlitz County rated good (46.6%); 6 (3.7%) are rated poor.
• Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
• Its condition class and component ratings are unchanged from the 2024 inventory.
• Its most recent inspection on record is dated September 2022, on a 48-month routine inspection cycle.
• A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

View this bridge on a map → (46.14698, -123.0029)

Component ratings

Bridge details

Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.

Busiest bridges in Cowlitz County

All bridges nearby: Cowlitz County, WA bridge conditions · every bridge in Cowlitz County · Washington bridges.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.