Thorne RD over Kishwaukee Riv
PoorMcHenry County, Illinois · 3.0 MI W of Marengo · Structure no. 056315100000000
- Built
- 1992
- 33 years old
- Condition
- Poor
- inspected October 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 216 ft
- 4 main spans
- Daily traffic
- 275
- 2021 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
Thorne RD over Kishwaukee Riv is a prestressed concrete box beam or girders - multiple carrying Thorne RD over Kishwaukee Riv in McHenry County, Illinois. It was built in 1992, so it is 33 years old, younger 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 275 vehicles a day, roughly 13% of them trucks, projected to reach 330 by 2046. The structure is 216 ft (65.9 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Thorne RD over Kishwaukee Riv built?
It was built in 1992, making it 33 years old in 2025.
What condition is Thorne RD over Kishwaukee Riv 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 Thorne RD over Kishwaukee Riv carry?
About 275 vehicles per day (2021 count), of which roughly 13% are trucks.
How long is Thorne RD over Kishwaukee Riv?
The structure is 216 ft (65.9 m) long with a longest span of 54 ft (16.5 m) and a deck 28 ft wide.
Who owns Thorne RD over Kishwaukee Riv?
It is owned by the Town or Township Highway Agency.