TR 171 over SW Mason City Ditch
FairMason County, Illinois · 1.5M SW Mason City · Structure no. 063420300000000
- Built
- 1983
- 42 years old
- Condition
- Fair
- inspected January 2025
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 30 ft
- 1 main span
- Daily traffic
- 175
- 2024 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
TR 171 over SW Mason City Ditch is a prestressed concrete box beam or girders - multiple carrying TR 171 over SW Mason City Ditch in Mason County, Illinois. It was built in 1983, so it is 42 years old, younger 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 175 vehicles a day, roughly 4% of them trucks, projected to reach 177 by 2046. The structure is 30 ft (9.1 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was TR 171 over SW Mason City Ditch built?
It was built in 1983, making it 42 years old in 2025.
What condition is TR 171 over SW Mason City Ditch 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 January 2025.
How much traffic does TR 171 over SW Mason City Ditch carry?
About 175 vehicles per day (2024 count), of which roughly 4% are trucks.
How long is TR 171 over SW Mason City Ditch?
The structure is 30 ft (9.1 m) long with a longest span of 28 ft (8.4 m) and a deck 26 ft wide.
Who owns TR 171 over SW Mason City Ditch?
It is owned by the Town or Township Highway Agency.