County Line RD over Kishwaukee Overflow
PoorPosted for loadMcHenry County, Illinois · 0.5 M N Ofus 20 · Structure no. 056312000000000
- Built
- 1978
- 47 years old
- Condition
- Poor
- inspected October 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 97 ft
- 2 main spans
- Daily traffic
- 475
- 2017 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
County Line RD over Kishwaukee Overflow is a prestressed concrete box beam or girders - multiple carrying County Line RD over Kishwaukee Overflow in McHenry County, Illinois. It was built in 1978, so it is 47 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 3 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. Its operating status is: posted for load restriction.
It carries about 475 vehicles a day, roughly 10% of them trucks, projected to reach 570 by 2046. The structure is 97 ft (29.6 m) long and 27 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Superstructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was County Line RD over Kishwaukee Overflow built?
It was built in 1978, making it 47 years old in 2025.
What condition is County Line RD over Kishwaukee Overflow 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 October 2024.
How much traffic does County Line RD over Kishwaukee Overflow carry?
About 475 vehicles per day (2017 count), of which roughly 10% are trucks.
How long is County Line RD over Kishwaukee Overflow?
The structure is 97 ft (29.6 m) long with a longest span of 46 ft (14 m) and a deck 27 ft wide.
Who owns County Line RD over Kishwaukee Overflow?
It is owned by the Town or Township Highway Agency.