I-90 over Kachess River
Kittitas County, Washington · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I-90 over Kachess River in Kittitas County, Washington, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1958 and reconstructed in 1976, making it 67 years old at the 2025 inventory.
- It carries about 17,108 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 → (47.25697, -121.20311)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 3 | Serious condition |
| Superstructure | 5 | Fair condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 149 ft |
| Location | 14.8 E Jct SR 906 |
| NBI structure number | 0005702A0000000 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.
All bridges nearby: Kittitas County, WA bridge conditions · Washington bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.