I-90 over SR 906
PoorKittitas County, Washington · 2.1 E King CO · Structure no. 0008447C0000000
- Built
- 1969
- 56 years old
- Condition
- Poor
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 182 ft
- 3 main spans
- Daily traffic
- 17,758
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-90 over SR 906 is a prestressed concrete continuous stringer/multi-beam or girder carrying I-90 over SR 906 in Kittitas County, Washington. It was built in 1969, so it is 56 years old, older than the Washington average of 49.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 17,758 vehicles a day, roughly 21% of them trucks, projected to reach 21,804 by 2039. The structure is 182 ft (55.5 m) long and 154 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-90 over SR 906 built?
It was built in 1969, making it 56 years old in 2025.
What condition is I-90 over SR 906 in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2023.
How much traffic does I-90 over SR 906 carry?
About 17,758 vehicles per day (2023 count), of which roughly 21% are trucks.
How long is I-90 over SR 906?
The structure is 182 ft (55.5 m) long with a longest span of 83 ft (25.3 m) and a deck 154 ft wide.
Who owns I-90 over SR 906?
It is owned by the State Highway Agency.