CH-11 (fas 666) over Kaskaskia River
FairDouglas County, Illinois · 2.95 MI W of Arcola · Structure no. 021452000000000
- Built
- 1961
- 64 years old, rebuilt 2010
- Condition
- Fair
- inspected February 2025
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 251 ft
- 5 main spans
- Daily traffic
- 1,450
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
CH-11 (fas 666) over Kaskaskia River is a prestressed concrete box beam or girders - multiple carrying CH-11 (fas 666) over Kaskaskia River in Douglas County, Illinois. It was built in 1961 and reconstructed in 2010, so it is 64 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 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 1,450 vehicles a day, roughly 21% of them trucks, projected to reach 1,162 by 2046. The structure is 251 ft (76.6 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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-11 (fas 666) over Kaskaskia River built?
It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2010.
What condition is CH-11 (fas 666) over Kaskaskia 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 February 2025.
How much traffic does CH-11 (fas 666) over Kaskaskia River carry?
About 1,450 vehicles per day (2022 count), of which roughly 21% are trucks.
How long is CH-11 (fas 666) over Kaskaskia River?
The structure is 251 ft (76.6 m) long with a longest span of 49 ft (14.8 m) and a deck 27 ft wide.
Who owns CH-11 (fas 666) over Kaskaskia River?
It is owned by the County Highway Agency.