I-90 Westbound over Kachess River
GoodKittitas County, Washington · 14.8 MI E SR 906 · Structure no. 0019558A0000000
- Built
- 2022
- 3 years old
- Condition
- Good
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 126 ft
- 1 main span
- Daily traffic
- 17,108
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-90 Westbound over Kachess River is a prestressed concrete stringer/multi-beam or girder carrying I-90 Westbound over Kachess River in Kittitas County, Washington. It was built in 2022, so it is 3 years old, younger than the Washington average of 49.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 17,108 vehicles a day, roughly 21% of them trucks, projected to reach 21,135 by 2039. The structure is 126 ft (38.4 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-90 Westbound over Kachess River built?
It was built in 2022, making it 3 years old in 2025.
What condition is I-90 Westbound over Kachess River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.
How much traffic does I-90 Westbound over Kachess River carry?
About 17,108 vehicles per day (2023 count), of which roughly 21% are trucks.
How long is I-90 Westbound over Kachess River?
The structure is 126 ft (38.4 m) long with a longest span of 123 ft (37.5 m) and a deck 52 ft wide.
Who owns I-90 Westbound over Kachess River?
It is owned by the State Highway Agency.