I-90 over Yellowstone RD
PoorKittitas County, Washington · 0.3 E King CO · Structure no. 0008447B0000000
- Built
- 1969
- 56 years old
- Condition
- Poor
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 195 ft
- 3 main spans
- Daily traffic
- 17,215
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-90 over Yellowstone RD is a prestressed concrete continuous stringer/multi-beam or girder carrying I-90 over Yellowstone RD 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 3 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 17,215 vehicles a day, roughly 21% of them trucks, projected to reach 21,373 by 2039. The structure is 195 ft (59.4 m) long and 128 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| 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 Yellowstone RD built?
It was built in 1969, making it 56 years old in 2025.
What condition is I-90 over Yellowstone RD 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 Yellowstone RD carry?
About 17,215 vehicles per day (2023 count), of which roughly 21% are trucks.
How long is I-90 over Yellowstone RD?
The structure is 195 ft (59.4 m) long with a longest span of 82 ft (25 m) and a deck 128 ft wide.
Who owns I-90 over Yellowstone RD?
It is owned by the State Highway Agency.