I-90 over Umptanum RD
PoorKittitas County, Washington · 2.2 E JCT US 97 · Structure no. 0008200C0000000
- Built
- 1967
- 58 years old
- Condition
- Poor
- inspected August 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 162 ft
- 3 main spans
- Daily traffic
- 15,658
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-90 over Umptanum RD is a concrete continuous tee beam carrying I-90 over Umptanum RD in Kittitas County, Washington. It was built in 1967, so it is 58 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 15,658 vehicles a day, roughly 23% of them trucks, projected to reach 19,097 by 2039. The structure is 162 ft (49.4 m) long and 41 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-90 over Umptanum RD built?
It was built in 1967, making it 58 years old in 2025.
What condition is I-90 over Umptanum 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 August 2023.
How much traffic does I-90 over Umptanum RD carry?
About 15,658 vehicles per day (2023 count), of which roughly 23% are trucks.
How long is I-90 over Umptanum RD?
The structure is 162 ft (49.4 m) long with a longest span of 53 ft (16.2 m) and a deck 41 ft wide.
Who owns I-90 over Umptanum RD?
It is owned by the State Highway Agency.