I-5 over Skookumchuck River
FairLewis County, Washington · 0.7 N JCT SR 507 · Structure no. 0011757B0000000
- Built
- 1951
- 74 years old
- Condition
- Fair
- inspected June 2024
- Type
- Truss - Thru
- Steel
- Length
- 252 ft
- 1 main span
- Daily traffic
- 24,769
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-5 over Skookumchuck River is a steel truss - thru carrying I-5 over Skookumchuck River in Lewis County, Washington. It was built in 1951, so it is 74 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 6 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 24,769 vehicles a day, roughly 17% of them trucks, projected to reach 33,066 by 2039. The structure is 252 ft (76.8 m) long and 35 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-5 over Skookumchuck River built?
It was built in 1951, making it 74 years old in 2025.
What condition is I-5 over Skookumchuck River 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 June 2024.
How much traffic does I-5 over Skookumchuck River carry?
About 24,769 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is I-5 over Skookumchuck River?
The structure is 252 ft (76.8 m) long with a longest span of 160 ft (48.8 m) and a deck 35 ft wide.
Who owns I-5 over Skookumchuck River?
It is owned by the State Highway Agency.