I-90 over Silica RD
GoodGrant County, Washington · 6.1 E JCT SR 26 · Structure no. 0011975A0000000
- Built
- 1981
- 44 years old
- Condition
- Good
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 123 ft
- 1 main span
- Daily traffic
- 8,141
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-90 over Silica RD is a prestressed concrete stringer/multi-beam or girder carrying I-90 over Silica RD in Grant County, Washington. It was built in 1981, so it is 44 years old, younger 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 8,141 vehicles a day, roughly 28% of them trucks, projected to reach 9,956 by 2039. The structure is 123 ft (37.5 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
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 I-90 over Silica RD built?
It was built in 1981, making it 44 years old in 2025.
What condition is I-90 over Silica RD 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 June 2024.
How much traffic does I-90 over Silica RD carry?
About 8,141 vehicles per day (2023 count), of which roughly 28% are trucks.
How long is I-90 over Silica RD?
The structure is 123 ft (37.5 m) long with a longest span of 117 ft (35.7 m) and a deck 41 ft wide.
Who owns I-90 over Silica RD?
It is owned by the State Highway Agency.