Il 121 (fap 320) over West Okaw River
PoorMoultrie County, Illinois · SE of Bethany · Structure no. 070000200000000
- Built
- 1966
- 59 years old
- Condition
- Poor
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 461 ft
- 6 main spans
- Daily traffic
- 4,700
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Il 121 (fap 320) over West Okaw River is a steel continuous stringer/multi-beam or girder carrying Il 121 (fap 320) over West Okaw River in Moultrie County, Illinois. It was built in 1966, so it is 59 years old, older than the Illinois average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 4,700 vehicles a day, roughly 11% of them trucks, projected to reach 5,408 by 2046. The structure is 461 ft (140.5 m) long and 36 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Il 121 (fap 320) over West Okaw River built?
It was built in 1966, making it 59 years old in 2025.
What condition is Il 121 (fap 320) over West Okaw River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2023.
How much traffic does Il 121 (fap 320) over West Okaw River carry?
About 4,700 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is Il 121 (fap 320) over West Okaw River?
The structure is 461 ft (140.5 m) long with a longest span of 89 ft (27 m) and a deck 36 ft wide.
Who owns Il 121 (fap 320) over West Okaw River?
It is owned by the State Highway Agency.