Csah 31 over Thief River
GoodPennington County, Minnesota · 1.4 MI N of JCT TH 1 · Structure no. 57504
- Built
- 1978
- 47 years old
- Condition
- Good
- inspected October 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 172 ft
- 3 main spans
- Daily traffic
- 260
- 2019 count
- Owner
- County
- County Highway Agency
About this bridge
Csah 31 over Thief River is a prestressed concrete tee beam carrying Csah 31 over Thief River in Pennington County, Minnesota. It was built in 1978, so it is 47 years old, older than the Minnesota average of 38.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 260 vehicles a day, projected to reach 230 by 2039. The structure is 172 ft (52.3 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Csah 31 over Thief River built?
It was built in 1978, making it 47 years old in 2025.
What condition is Csah 31 over Thief River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.
How much traffic does Csah 31 over Thief River carry?
About 260 vehicles per day (2019 count).
How long is Csah 31 over Thief River?
The structure is 172 ft (52.3 m) long with a longest span of 57 ft (17.3 m) and a deck 37 ft wide.
Who owns Csah 31 over Thief River?
It is owned by the County Highway Agency.