Mn 1 over Thief River
FairPennington County, Minnesota · 0.3 MI E of JCT TH 32 · Structure no. 9070
- Built
- 1956
- 69 years old, rebuilt 1988
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 175 ft
- 3 main spans
- Daily traffic
- 5,800
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
Mn 1 over Thief River is a prestressed concrete stringer/multi-beam or girder carrying Mn 1 over Thief River in Pennington County, Minnesota. It was built in 1956 and reconstructed in 1988, so it is 69 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 5,800 vehicles a day, roughly 4% of them trucks, projected to reach 6,100 by 2039. The structure is 175 ft (53.3 m) long and 62 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mn 1 over Thief River built?
It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1988.
What condition is Mn 1 over Thief 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 August 2024.
How much traffic does Mn 1 over Thief River carry?
About 5,800 vehicles per day (2019 count), of which roughly 4% are trucks.
How long is Mn 1 over Thief River?
The structure is 175 ft (53.3 m) long with a longest span of 65 ft (19.8 m) and a deck 62 ft wide.
Who owns Mn 1 over Thief River?
It is owned by the State Highway Agency.