SR 432 over Solo Slough
Cowlitz County, Washington · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 432 over Solo Slough in Cowlitz County, Washington, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- 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.
- 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
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Steel culvert |
| Length | about 22 ft |
| Location | 2.8 E Jct SR 4 |
| NBI structure number | 002001110000000 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.
Busiest bridges in Cowlitz County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-5 over Bn Ry | 1972 | 37,599 | Fair |
| I-5 over Kalama River | 1971 | 37,279 | Good |
| I-5 over Kalama River | 1970 | 37,279 | Good |
| I-5 over Owl Creek | 1972 | 36,932 | Good |
| I-5 over Owl Creek | 1972 | 36,932 | Good |
| I-5 over Todd Rd | 1971 | 35,483 | Good |
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.