US 12 over Mill Creek
FairLewis County, Washington · 12.5 E JCT I-5 · Structure no. 0002328A0000000
- Built
- 1938
- 87 years old, rebuilt 1971
- Condition
- Fair
- inspected March 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 160 ft
- 3 main spans
- Daily traffic
- 7,862
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 12 over Mill Creek is a concrete continuous tee beam carrying US 12 over Mill Creek in Lewis County, Washington. It was built in 1938 and reconstructed in 1971, so it is 87 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 7,862 vehicles a day, roughly 14% of them trucks, projected to reach 9,947 by 2039. The structure is 160 ft (48.8 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 12 over Mill Creek built?
It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1971.
What condition is US 12 over Mill Creek 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 March 2023.
How much traffic does US 12 over Mill Creek carry?
About 7,862 vehicles per day (2023 count), of which roughly 14% are trucks.
How long is US 12 over Mill Creek?
The structure is 160 ft (48.8 m) long with a longest span of 90 ft (27.4 m) and a deck 43 ft wide.
Who owns US 12 over Mill Creek?
It is owned by the State Highway Agency.