STH312WB(OLD STH12 over Chippewa River
FairEau Claire County, Wisconsin · 1.4M S JCT Ush 53 to S · Structure no. B18013100000000
- Built
- 1992
- 33 years old, rebuilt 1993
- Condition
- Fair
- inspected July 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 1,488 ft
- 10 main spans
- Daily traffic
- 12,450
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
STH312WB(OLD STH12 over Chippewa River is a steel continuous stringer/multi-beam or girder carrying STH312WB(OLD STH12 over Chippewa River in Eau Claire County, Wisconsin. It was built in 1992 and reconstructed in 1993, so it is 33 years old, younger than the Wisconsin average of 40.3 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 12,450 vehicles a day, roughly 3% of them trucks, projected to reach 14,940 by 2041. The structure is 1,488 ft (453.5 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 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 STH312WB(OLD STH12 over Chippewa River built?
It was built in 1992, making it 33 years old in 2025. It was reconstructed in 1993.
What condition is STH312WB(OLD STH12 over Chippewa 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 July 2023.
How much traffic does STH312WB(OLD STH12 over Chippewa River carry?
About 12,450 vehicles per day (2021 count), of which roughly 3% are trucks.
How long is STH312WB(OLD STH12 over Chippewa River?
The structure is 1,488 ft (453.5 m) long with a longest span of 154 ft (46.9 m) and a deck 43 ft wide.
Who owns STH312WB(OLD STH12 over Chippewa River?
It is owned by the State Highway Agency.