Sth 77 over Soo Line
FairWashburn County, Wisconsin · 3.1M E JCT Cth G · Structure no. B65000600000000
- Built
- 1958
- 67 years old, rebuilt 1990
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 150 ft
- 3 main spans
- Daily traffic
- 1,900
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Sth 77 over Soo Line is a steel continuous stringer/multi-beam or girder carrying Sth 77 over Soo Line in Washburn County, Wisconsin. It was built in 1958 and reconstructed in 1990, so it is 67 years old, older 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 5 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 1,900 vehicles a day, roughly 9% of them trucks, projected to reach 2,400 by 2042. The structure is 150 ft (45.7 m) long and 35 ft wide. If it were closed, the detour would be 17.4 mi (28 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Sth 77 over Soo Line built?
It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1990.
What condition is Sth 77 over Soo Line 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 77 over Soo Line carry?
About 1,900 vehicles per day (2022 count), of which roughly 9% are trucks.
How long is Sth 77 over Soo Line?
The structure is 150 ft (45.7 m) long with a longest span of 55 ft (16.8 m) and a deck 35 ft wide.
Who owns Sth 77 over Soo Line?
It is owned by the State Highway Agency.