US 8 over ST Croix River
FairChisago County, Minnesota · At Wisconsin State Line · Structure no. 6566
- Built
- 1955
- 70 years old, rebuilt 1985
- Condition
- Fair
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 406 ft
- 3 main spans
- Daily traffic
- 13,300
- 2018 count
- Owner
- State
- State Highway Agency
About this bridge
US 8 over ST Croix River is a steel continuous stringer/multi-beam or girder carrying US 8 over ST Croix River in Chisago County, Minnesota. It was built in 1955 and reconstructed in 1985, so it is 70 years old, older than the Minnesota average of 38.5 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 13,300 vehicles a day, roughly 6% of them trucks, projected to reach 13,900 by 2038. The structure is 406 ft (123.7 m) long and 63 ft wide. If it were closed, the detour would be 29.8 mi (48 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 8 over ST Croix River built?
It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1985.
What condition is US 8 over ST Croix 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 April 2024.
How much traffic does US 8 over ST Croix River carry?
About 13,300 vehicles per day (2018 count), of which roughly 6% are trucks.
How long is US 8 over ST Croix River?
The structure is 406 ft (123.7 m) long with a longest span of 160 ft (48.8 m) and a deck 63 ft wide.
Who owns US 8 over ST Croix River?
It is owned by the State Highway Agency.