Il 31 over Nippersink Creek
FairMcHenry County, Illinois · 1.5 M S of US 12 · Structure no. 056003700000000
- Built
- 1927
- 98 years old, rebuilt 1988
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 167 ft
- 3 main spans
- Daily traffic
- 7,600
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Il 31 over Nippersink Creek is a steel continuous stringer/multi-beam or girder carrying Il 31 over Nippersink Creek in McHenry County, Illinois. It was built in 1927 and reconstructed in 1988, so it is 98 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 7,600 vehicles a day, roughly 5% of them trucks, projected to reach 9,540 by 2046. The structure is 167 ft (50.9 m) long and 48 ft wide. If it were closed, the detour would be 19.3 mi (31 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 31 over Nippersink Creek built?
It was built in 1927, making it 98 years old in 2025. It was reconstructed in 1988.
What condition is Il 31 over Nippersink Creek 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 May 2023.
How much traffic does Il 31 over Nippersink Creek carry?
About 7,600 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is Il 31 over Nippersink Creek?
The structure is 167 ft (50.9 m) long with a longest span of 56 ft (17.1 m) and a deck 48 ft wide.
Who owns Il 31 over Nippersink Creek?
It is owned by the State Highway Agency.