Ill 121 over Deer Creek
GoodLogan County, Illinois · 1.3MI SE Lincoln · Structure no. 054010600000000
- Built
- 1999
- 26 years old
- Condition
- Good
- inspected April 2021
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 231 ft
- 3 main spans
- Daily traffic
- 3,650
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 121 over Deer Creek is a prestressed concrete stringer/multi-beam or girder carrying Ill 121 over Deer Creek in Logan County, Illinois. It was built in 1999, so it is 26 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 3,650 vehicles a day, roughly 16% of them trucks, projected to reach 3,833 by 2046. The structure is 231 ft (70.3 m) long and 39 ft wide. If it were closed, the detour would be 19.3 mi (31 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 | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 121 over Deer Creek built?
It was built in 1999, making it 26 years old in 2025.
What condition is Ill 121 over Deer Creek 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 April 2021.
How much traffic does Ill 121 over Deer Creek carry?
About 3,650 vehicles per day (2023 count), of which roughly 16% are trucks.
How long is Ill 121 over Deer Creek?
The structure is 231 ft (70.3 m) long with a longest span of 80 ft (24.4 m) and a deck 39 ft wide.
Who owns Ill 121 over Deer Creek?
It is owned by the State Highway Agency.