TR-105 (spring Rd) over Mazon River
FairGrundy County, Illinois · .3 MI E Campbell RD · Structure no. 032510000000000
- Built
- 1910
- 115 years old, rebuilt 2015
- Condition
- Fair
- inspected October 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 162 ft
- 3 main spans
- Daily traffic
- 75
- 2024 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
TR-105 (spring Rd) over Mazon River is a prestressed concrete box beam or girders - multiple carrying TR-105 (spring Rd) over Mazon River in Grundy County, Illinois. It was built in 1910 and reconstructed in 2015, so it is 115 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 75 vehicles a day, roughly 32% of them trucks, projected to reach 120 by 2046. The structure is 162 ft (49.3 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-105 (spring Rd) over Mazon River built?
It was built in 1910, making it 115 years old in 2025. It was reconstructed in 2015.
What condition is TR-105 (spring Rd) over Mazon 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-105 (spring Rd) over Mazon River carry?
About 75 vehicles per day (2024 count), of which roughly 32% are trucks.
How long is TR-105 (spring Rd) over Mazon River?
The structure is 162 ft (49.3 m) long with a longest span of 52 ft (16 m) and a deck 26 ft wide.
Who owns TR-105 (spring Rd) over Mazon River?
It is owned by the Town or Township Highway Agency.