S Main ST over I-90
GoodKittitas County, Washington · 4.6 E JCT I-82 · Structure no. 0008386A0000000
- Built
- 1968
- 57 years old
- Condition
- Good
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 285 ft
- 4 main spans
- Daily traffic
- 2,071
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
S Main ST over I-90 is a prestressed concrete continuous stringer/multi-beam or girder carrying S Main ST over I-90 in Kittitas County, Washington. It was built in 1968, so it is 57 years old, older 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 2,071 vehicles a day, roughly 5% of them trucks, projected to reach 2,789 by 2040. The structure is 285 ft (86.9 m) long and 53 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S Main ST over I-90 built?
It was built in 1968, making it 57 years old in 2025.
What condition is S Main ST over I-90 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 September 2023.
How much traffic does S Main ST over I-90 carry?
About 2,071 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is S Main ST over I-90?
The structure is 285 ft (86.9 m) long with a longest span of 95 ft (29 m) and a deck 53 ft wide.
Who owns S Main ST over I-90?
It is owned by the State Highway Agency.