Ill 123 over Sangamon River
FairMenard County, Illinois · .2MI E Petersburg · Structure no. 065001600000000
- Built
- 1985
- 40 years old
- Condition
- Fair
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 921 ft
- 3 main spans
- Daily traffic
- 4,800
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 123 over Sangamon River is a steel continuous stringer/multi-beam or girder carrying Ill 123 over Sangamon River in Menard County, Illinois. It was built in 1985, so it is 40 years old, younger 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 4,800 vehicles a day, roughly 6% of them trucks, projected to reach 6,161 by 2046. The structure is 921 ft (280.8 m) long and 45 ft wide. If it were closed, the detour would be 29.2 mi (47 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 123 over Sangamon River built?
It was built in 1985, making it 40 years old in 2025.
What condition is Ill 123 over Sangamon 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 July 2024.
How much traffic does Ill 123 over Sangamon River carry?
About 4,800 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is Ill 123 over Sangamon River?
The structure is 921 ft (280.8 m) long with a longest span of 214 ft (65.2 m) and a deck 45 ft wide.
Who owns Ill 123 over Sangamon River?
It is owned by the State Highway Agency.