I-255 SB Mainline over I-270
GoodMadison County, Illinois · 1.9MI W Ill 157 · Structure no. 060022200000000
- Built
- 1987
- 38 years old
- Condition
- Good
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 278 ft
- 3 main spans
- Daily traffic
- 20,250
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-255 SB Mainline over I-270 is a steel continuous stringer/multi-beam or girder carrying I-255 SB Mainline over I-270 in Madison County, Illinois. It was built in 1987, so it is 38 years old, younger than the Illinois average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 20,250 vehicles a day, roughly 10% of them trucks, projected to reach 21,935 by 2046. The structure is 278 ft (84.6 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-255 SB Mainline over I-270 built?
It was built in 1987, making it 38 years old in 2025.
What condition is I-255 SB Mainline over I-270 in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.
How much traffic does I-255 SB Mainline over I-270 carry?
About 20,250 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is I-255 SB Mainline over I-270?
The structure is 278 ft (84.6 m) long with a longest span of 108 ft (32.9 m) and a deck 59 ft wide.
Who owns I-255 SB Mainline over I-270?
It is owned by the State Highway Agency.