US 12 over Nippersink CR Overfl
PoorMcHenry County, Illinois · 0.3 M N of CO Line · Structure no. 056002000000000
- Built
- 1939
- 86 years old, rebuilt 1990
- Condition
- Poor
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 190 ft
- 3 main spans
- Daily traffic
- 11,500
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 12 over Nippersink CR Overfl is a steel continuous stringer/multi-beam or girder carrying US 12 over Nippersink CR Overfl in McHenry County, Illinois. It was built in 1939 and reconstructed in 1990, so it is 86 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 11,500 vehicles a day, roughly 8% of them trucks, projected to reach 13,440 by 2046. The structure is 190 ft (57.9 m) long and 67 ft wide. If it were closed, the detour would be 14.3 mi (23 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 US 12 over Nippersink CR Overfl built?
It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1990.
What condition is US 12 over Nippersink CR Overfl 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 November 2024.
How much traffic does US 12 over Nippersink CR Overfl carry?
About 11,500 vehicles per day (2023 count), of which roughly 8% are trucks.
How long is US 12 over Nippersink CR Overfl?
The structure is 190 ft (57.9 m) long with a longest span of 73 ft (22.3 m) and a deck 67 ft wide.
Who owns US 12 over Nippersink CR Overfl?
It is owned by the State Highway Agency.