US 12 over Cowlitz River
GoodLewis County, Washington · 1.8 E JCT SR 122 · Structure no. 0006542A0000000
- Built
- 1961
- 64 years old
- Condition
- Good
- inspected February 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 1,070 ft
- 3 main spans
- Daily traffic
- 6,690
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 12 over Cowlitz River is a steel continuous stringer/multi-beam or girder carrying US 12 over Cowlitz River in Lewis County, Washington. It was built in 1961, so it is 64 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 6,690 vehicles a day, roughly 23% of them trucks, projected to reach 8,521 by 2039. The structure is 1,070 ft (326.1 m) long and 33 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 12 over Cowlitz River built?
It was built in 1961, making it 64 years old in 2025.
What condition is US 12 over Cowlitz River 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 February 2024.
How much traffic does US 12 over Cowlitz River carry?
About 6,690 vehicles per day (2023 count), of which roughly 23% are trucks.
How long is US 12 over Cowlitz River?
The structure is 1,070 ft (326.1 m) long with a longest span of 185 ft (56.4 m) and a deck 33 ft wide.
Who owns US 12 over Cowlitz River?
It is owned by the State Highway Agency.