TR 171 over Br Mackinaw River
FairMcLean County, Illinois · 1.5 MI W Colfax · Structure no. 057500100000000
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected October 2024
- Type
- Slab
- Concrete Continuous
- Length
- 57 ft
- 3 main spans
- Daily traffic
- 50
- 2024 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
TR 171 over Br Mackinaw River is a concrete continuous slab carrying TR 171 over Br Mackinaw River in McLean County, Illinois. It was built in 1971, so it is 54 years old, older than the Illinois average of 45.3 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 50 vehicles a day, roughly 4% of them trucks, projected to reach 51 by 2046. The structure is 57 ft (17.4 m) long and 26 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 | 7 Good | Some minor problems. |
| 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 TR 171 over Br Mackinaw River built?
It was built in 1971, making it 54 years old in 2025.
What condition is TR 171 over Br Mackinaw 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 October 2024.
How much traffic does TR 171 over Br Mackinaw River carry?
About 50 vehicles per day (2024 count), of which roughly 4% are trucks.
How long is TR 171 over Br Mackinaw River?
The structure is 57 ft (17.4 m) long with a longest span of 21 ft (6.4 m) and a deck 26 ft wide.
Who owns TR 171 over Br Mackinaw River?
It is owned by the Town or Township Highway Agency.