WB I-74 over Mackinaw River
PoorWoodford County, Illinois · 1.26 MI E of Ill 117 · Structure no. 102000100000000
- Built
- 1964
- 61 years old, rebuilt 1998
- Condition
- Poor
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 422 ft
- 4 main spans
- Daily traffic
- 14,200
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
WB I-74 over Mackinaw River is a steel continuous stringer/multi-beam or girder carrying WB I-74 over Mackinaw River in Woodford County, Illinois. It was built in 1964 and reconstructed in 1998, so it is 61 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 14,200 vehicles a day, roughly 18% of them trucks, projected to reach 13,585 by 2046. The structure is 422 ft (128.6 m) long and 41 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| 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 WB I-74 over Mackinaw River built?
It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1998.
What condition is WB I-74 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 August 2024.
How much traffic does WB I-74 over Mackinaw River carry?
About 14,200 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is WB I-74 over Mackinaw River?
The structure is 422 ft (128.6 m) long with a longest span of 117 ft (35.7 m) and a deck 41 ft wide.
Who owns WB I-74 over Mackinaw River?
It is owned by the State Highway Agency.