Il 31 over Crystal Creek
GoodMcHenry County, Illinois · 0.1 M S Algonquin RD · Structure no. 056007700000000
- Built
- 2013
- 12 years old
- Condition
- Good
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 139 ft
- 1 main span
- Daily traffic
- 17,900
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Il 31 over Crystal Creek is a steel stringer/multi-beam or girder carrying Il 31 over Crystal Creek in McHenry County, Illinois. It was built in 2013, so it is 12 years old, younger than the Illinois average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 17,900 vehicles a day, roughly 7% of them trucks, projected to reach 19,560 by 2046. The structure is 139 ft (42.5 m) long and 78 ft wide.
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Il 31 over Crystal Creek built?
It was built in 2013, making it 12 years old in 2025.
What condition is Il 31 over Crystal Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.
How much traffic does Il 31 over Crystal Creek carry?
About 17,900 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is Il 31 over Crystal Creek?
The structure is 139 ft (42.5 m) long with a longest span of 133 ft (40.4 m) and a deck 78 ft wide.
Who owns Il 31 over Crystal Creek?
It is owned by the State Highway Agency.