US 97 over Siwash Creek
GoodOkanogan County, Washington · 0.6 N JCT SR 20 · Structure no. 0003403A0000000
- Built
- 1948
- 77 years old
- Condition
- Good
- inspected July 2023
- Type
- Tee Beam
- Concrete
- Length
- 52 ft
- 1 main span
- Daily traffic
- 4,282
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 97 over Siwash Creek is a concrete tee beam carrying US 97 over Siwash Creek in Okanogan County, Washington. It was built in 1948, so it is 77 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 4,282 vehicles a day, roughly 10% of them trucks, projected to reach 5,191 by 2039. The structure is 52 ft (15.8 m) long and 36 ft wide. If it were closed, the detour would be 13 mi (21 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. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 97 over Siwash Creek built?
It was built in 1948, making it 77 years old in 2025.
What condition is US 97 over Siwash Creek 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 July 2023.
How much traffic does US 97 over Siwash Creek carry?
About 4,282 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is US 97 over Siwash Creek?
The structure is 52 ft (15.8 m) long with a longest span of 50 ft (15.2 m) and a deck 36 ft wide.
Who owns US 97 over Siwash Creek?
It is owned by the State Highway Agency.