US 12 20 45 Mannhe over RR - UP Proviso Yd
FairCook County, Illinois · 0.3 M S US 20 · Structure no. 016033700000000
- Built
- 1954
- 71 years old, rebuilt 1998
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 1,408 ft
- 18 main spans
- Daily traffic
- 43,600
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 12 20 45 Mannhe over RR - UP Proviso Yd is a steel continuous stringer/multi-beam or girder carrying US 12 20 45 Mannhe over RR - UP Proviso Yd in Cook County, Illinois. It was built in 1954 and reconstructed in 1998, so it is 71 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 43,600 vehicles a day, roughly 12% of them trucks, projected to reach 43,430 by 2046. The structure is 1,408 ft (429.2 m) long and 72 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 12 20 45 Mannhe over RR - UP Proviso Yd built?
It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1998.
What condition is US 12 20 45 Mannhe over RR - UP Proviso Yd 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 August 2024.
How much traffic does US 12 20 45 Mannhe over RR - UP Proviso Yd carry?
About 43,600 vehicles per day (2023 count), of which roughly 12% are trucks.
How long is US 12 20 45 Mannhe over RR - UP Proviso Yd?
The structure is 1,408 ft (429.2 m) long with a longest span of 120 ft (36.6 m) and a deck 72 ft wide.
Who owns US 12 20 45 Mannhe over RR - UP Proviso Yd?
It is owned by the State Highway Agency.