Ill 9 over Mackinaw River
FairTazewell County, Illinois · 1.5 MI W of Mackinaw · Structure no. 090006300000000
- Built
- 1929
- 96 years old, rebuilt 1982
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 490 ft
- 6 main spans
- Daily traffic
- 2,700
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 9 over Mackinaw River is a prestressed concrete continuous stringer/multi-beam or girder carrying Ill 9 over Mackinaw River in Tazewell County, Illinois. It was built in 1929 and reconstructed in 1982, so it is 96 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 5 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 2,700 vehicles a day, roughly 10% of them trucks, projected to reach 3,283 by 2046. The structure is 490 ft (149.4 m) long and 35 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 9 over Mackinaw River built?
It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1982.
What condition is Ill 9 over 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 March 2024.
How much traffic does Ill 9 over Mackinaw River carry?
About 2,700 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is Ill 9 over Mackinaw River?
The structure is 490 ft (149.4 m) long with a longest span of 160 ft (48.8 m) and a deck 35 ft wide.
Who owns Ill 9 over Mackinaw River?
It is owned by the State Highway Agency.