TR 120 Old Mazon R over Johnny Run Creek
PoorGrundy County, Illinois · .5 MI S Reed RD · Structure no. 032498600000000
- Built
- 1982
- 43 years old
- Condition
- Poor
- inspected October 2024
- Type
- Channel Beam
- Concrete
- Length
- 98 ft
- 3 main spans
- Daily traffic
- 50
- 2024 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
TR 120 Old Mazon R over Johnny Run Creek is a concrete channel beam carrying TR 120 Old Mazon R over Johnny Run Creek in Grundy County, Illinois. It was built in 1982, so it is 43 years old, younger than the Illinois average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 50 vehicles a day, projected to reach 60 by 2046. The structure is 98 ft (29.9 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 120 Old Mazon R over Johnny Run Creek built?
It was built in 1982, making it 43 years old in 2025.
What condition is TR 120 Old Mazon R over Johnny Run Creek in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.
How much traffic does TR 120 Old Mazon R over Johnny Run Creek carry?
About 50 vehicles per day (2024 count).
How long is TR 120 Old Mazon R over Johnny Run Creek?
The structure is 98 ft (29.9 m) long with a longest span of 32 ft (9.8 m) and a deck 26 ft wide.
Who owns TR 120 Old Mazon R over Johnny Run Creek?
It is owned by the Town or Township Highway Agency.