M 171 over Otter Tail River
FairOtter Tail County, Minnesota · 0.6 MI E of Concord ST · Structure no. 56518
- Built
- 1974
- 51 years old
- Condition
- Fair
- inspected November 2023
- Type
- Channel Beam
- Prestressed Concrete
- Length
- 93 ft
- 3 main spans
- Daily traffic
- 625
- 1989 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
M 171 over Otter Tail River is a prestressed concrete channel beam carrying M 171 over Otter Tail River in Otter Tail County, Minnesota. It was built in 1974, so it is 51 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 625 vehicles a day, projected to reach 625 by 2029. The structure is 93 ft (28.4 m) long and 39 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 M 171 over Otter Tail River built?
It was built in 1974, making it 51 years old in 2025.
What condition is M 171 over Otter Tail 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 November 2023.
How much traffic does M 171 over Otter Tail River carry?
About 625 vehicles per day (1989 count).
How long is M 171 over Otter Tail River?
The structure is 93 ft (28.4 m) long with a longest span of 31 ft (9.5 m) and a deck 39 ft wide.
Who owns M 171 over Otter Tail River?
It is owned by the City or Municipal Highway Agency.