CH-21 over Snow Creek
FairJefferson County, Illinois · 1.5 MI S Boyd · Structure no. 041361800000000
- Built
- 1981
- 44 years old
- Condition
- Fair
- inspected July 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 121 ft
- 3 main spans
- Daily traffic
- 850
- 2021 count
- Owner
- County
- County Highway Agency
About this bridge
CH-21 over Snow Creek is a prestressed concrete box beam or girders - multiple carrying CH-21 over Snow Creek in Jefferson County, Illinois. It was built in 1981, so it is 44 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 5 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 850 vehicles a day, roughly 19% of them trucks, projected to reach 859 by 2046. The structure is 121 ft (36.9 m) long and 28 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 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was CH-21 over Snow Creek built?
It was built in 1981, making it 44 years old in 2025.
What condition is CH-21 over Snow Creek 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 CH-21 over Snow Creek carry?
About 850 vehicles per day (2021 count), of which roughly 19% are trucks.
How long is CH-21 over Snow Creek?
The structure is 121 ft (36.9 m) long with a longest span of 39 ft (11.9 m) and a deck 28 ft wide.
Who owns CH-21 over Snow Creek?
It is owned by the County Highway Agency.