I 35 over Unstable Material
FairSt. Louis County, Minnesota · 0.3 MI N of Garfield Ave · Structure no. 69887
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 2,109 ft
- 38 main spans
- Daily traffic
- 45,454
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
I 35 over Unstable Material is a prestressed concrete stringer/multi-beam or girder carrying I 35 over Unstable Material in St. Louis County, Minnesota. It was built in 1970, so it is 55 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 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 45,454 vehicles a day, roughly 5% of them trucks, projected to reach 57,000 by 2042. The structure is 2,109 ft (642.7 m) long and 116 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 I 35 over Unstable Material built?
It was built in 1970, making it 55 years old in 2025.
What condition is I 35 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 2023.
How much traffic does I 35 over Unstable Material carry?
About 45,454 vehicles per day (2022 count), of which roughly 5% are trucks.
How long is I 35 over Unstable Material?
The structure is 2,109 ft (642.7 m) long with a longest span of 56 ft (17.1 m) and a deck 116 ft wide.
Who owns I 35 over Unstable Material?
It is owned by the State Highway Agency.