Thorp HWY over I-90
FairKittitas County, Washington · 15.2 E JCT SR 970 · Structure no. 0007830A0000000
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 257 ft
- 4 main spans
- Daily traffic
- 1,925
- 2012 count
- Owner
- State
- State Highway Agency
About this bridge
Thorp HWY over I-90 is a prestressed concrete stringer/multi-beam or girder carrying Thorp HWY over I-90 in Kittitas County, Washington. It was built in 1966, so it is 59 years old, older than the Washington average of 49.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 1,925 vehicles a day, roughly 5% of them trucks. The structure is 257 ft (78.3 m) long and 33 ft wide. If it were closed, the detour would be 11.8 mi (19 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Thorp HWY over I-90 built?
It was built in 1966, making it 59 years old in 2025.
What condition is Thorp HWY over I-90 in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.
How much traffic does Thorp HWY over I-90 carry?
About 1,925 vehicles per day (2012 count), of which roughly 5% are trucks.
How long is Thorp HWY over I-90?
The structure is 257 ft (78.3 m) long with a longest span of 83 ft (25.3 m) and a deck 33 ft wide.
Who owns Thorp HWY over I-90?
It is owned by the State Highway Agency.