I-5 over Kelso Ave (old SR 431)
Cowlitz County, Washington · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I-5 over Kelso Ave (old SR 431) in Cowlitz County, Washington, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1980, making it 45 years old at the 2025 inventory.
- It carries about 27,119 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 April 2024, on a 24-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 → (46.15697, -122.90194)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 140 ft |
| Location | 0.9 N Jct SR 4 |
| NBI structure number | 0010495B0000000 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
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.