I-90 over W Nelson Siding RD
FairKittitas County, Washington · 19.3 E JCT SR 906 · Structure no. 0006883B0000000
- Built
- 1962
- 63 years old
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 104 ft
- 3 main spans
- Daily traffic
- 16,598
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-90 over W Nelson Siding RD is a prestressed concrete stringer/multi-beam or girder carrying I-90 over W Nelson Siding RD in Kittitas County, Washington. It was built in 1962, so it is 63 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 16,598 vehicles a day, roughly 23% of them trucks, projected to reach 21,518 by 2039. The structure is 104 ft (31.7 m) long and 42 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 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-90 over W Nelson Siding RD built?
It was built in 1962, making it 63 years old in 2025.
What condition is I-90 over W Nelson Siding RD 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 May 2024.
How much traffic does I-90 over W Nelson Siding RD carry?
About 16,598 vehicles per day (2023 count), of which roughly 23% are trucks.
How long is I-90 over W Nelson Siding RD?
The structure is 104 ft (31.7 m) long with a longest span of 32 ft (9.8 m) and a deck 42 ft wide.
Who owns I-90 over W Nelson Siding RD?
It is owned by the State Highway Agency.