Con 3704 over Unstable Material
FairSt. Louis County, Minnesota · 3.8 MI NE of JCT TH 535 · Structure no. 69841
- Built
- 1988
- 37 years old
- Condition
- Fair
- inspected June 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 708 ft
- 8 main spans
- Daily traffic
- 6,921
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
Con 3704 over Unstable Material is a concrete continuous box beam or girders - multiple carrying Con 3704 over Unstable Material in St. Louis County, Minnesota. It was built in 1988, so it is 37 years old, younger 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 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 6,921 vehicles a day, roughly 1% of them trucks, projected to reach 3,000 by 2041. The structure is 708 ft (215.8 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Con 3704 over Unstable Material built?
It was built in 1988, making it 37 years old in 2025.
What condition is Con 3704 over Unstable Material 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 June 2024.
How much traffic does Con 3704 over Unstable Material carry?
About 6,921 vehicles per day (2021 count), of which roughly 1% are trucks.
How long is Con 3704 over Unstable Material?
The structure is 708 ft (215.8 m) long with a longest span of 94 ft (28.7 m) and a deck 24 ft wide.
Who owns Con 3704 over Unstable Material?
It is owned by the State Highway Agency.