Sth 71-STH 108 over Black River
FairJackson County, Wisconsin · 1.1M E JCT Sth 54 · Structure no. B27007400000000
- Built
- 1985
- 40 years old
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 671 ft
- 7 main spans
- Daily traffic
- 3,300
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Sth 71-STH 108 over Black River is a prestressed concrete continuous stringer/multi-beam or girder carrying Sth 71-STH 108 over Black River in Jackson County, Wisconsin. It was built in 1985, so it is 40 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 3,300 vehicles a day, roughly 4% of them trucks, projected to reach 2,510 by 2042. The structure is 671 ft (204.6 m) long and 43 ft wide. If it were closed, the detour would be 42.9 mi (69 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Sth 71-STH 108 over Black River built?
It was built in 1985, making it 40 years old in 2025.
What condition is Sth 71-STH 108 over Black 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 September 2023.
How much traffic does Sth 71-STH 108 over Black River carry?
About 3,300 vehicles per day (2022 count), of which roughly 4% are trucks.
How long is Sth 71-STH 108 over Black River?
The structure is 671 ft (204.6 m) long with a longest span of 95 ft (29.1 m) and a deck 43 ft wide.
Who owns Sth 71-STH 108 over Black River?
It is owned by the State Highway Agency.