Old Ill 121 over Mackinaw River
PoorTazewell County, Illinois · 1MI N Hopedale JCT · Structure no. 090008700000000
- Built
- 1932
- 93 years old, rebuilt 1971
- Condition
- Poor
- inspected June 2024
- Type
- Truss - Thru
- Steel
- Length
- 671 ft
- 1 main span
- Daily traffic
- 75
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Old Ill 121 over Mackinaw River is a steel truss - thru carrying Old Ill 121 over Mackinaw River in Tazewell County, Illinois. It was built in 1932 and reconstructed in 1971, so it is 93 years old, older 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 3 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 75 vehicles a day, roughly 21% of them trucks, projected to reach 126 by 2046. The structure is 671 ft (204.5 m) long and 24 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 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Superstructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old Ill 121 over Mackinaw River built?
It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1971.
What condition is Old Ill 121 over Mackinaw River 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 June 2024.
How much traffic does Old Ill 121 over Mackinaw River carry?
About 75 vehicles per day (2023 count), of which roughly 21% are trucks.
How long is Old Ill 121 over Mackinaw River?
The structure is 671 ft (204.5 m) long with a longest span of 175 ft (53.3 m) and a deck 24 ft wide.
Who owns Old Ill 121 over Mackinaw River?
It is owned by the State Highway Agency.