US 34 (fap 591) over Somonauk Creek
GoodDeKalb County, Illinois · 1.1 Mi. W. Sandwich · Structure no. 019003900000000
- Built
- 1991
- 34 years old
- Condition
- Good
- inspected January 2022
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 127 ft
- 3 main spans
- Daily traffic
- 4,700
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 34 (fap 591) over Somonauk Creek is a prestressed concrete stringer/multi-beam or girder carrying US 34 (fap 591) over Somonauk Creek in DeKalb County, Illinois. It was built in 1991, so it is 34 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 4,700 vehicles a day, roughly 6% of them trucks, projected to reach 7,952 by 2046. The structure is 127 ft (38.6 m) long and 43 ft wide. If it were closed, the detour would be 19.3 mi (31 km).
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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 34 (fap 591) over Somonauk Creek built?
It was built in 1991, making it 34 years old in 2025.
What condition is US 34 (fap 591) over Somonauk 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 January 2022.
How much traffic does US 34 (fap 591) over Somonauk Creek carry?
About 4,700 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is US 34 (fap 591) over Somonauk Creek?
The structure is 127 ft (38.6 m) long with a longest span of 52 ft (15.8 m) and a deck 43 ft wide.
Who owns US 34 (fap 591) over Somonauk Creek?
It is owned by the State Highway Agency.