TR-43 over Somonauk Creek
PoorLaSalle County, Illinois · N 45th E 2602 · Structure no. 050308500000000
- Built
- 1953
- 72 years old
- Condition
- Poor
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 105 ft
- 3 main spans
- Daily traffic
- 100
- 2020 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
TR-43 over Somonauk Creek is a steel continuous stringer/multi-beam or girder carrying TR-43 over Somonauk Creek in LaSalle County, Illinois. It was built in 1953, so it is 72 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 100 vehicles a day, roughly 9% of them trucks, projected to reach 101 by 2046. The structure is 105 ft (32 m) long and 22 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was TR-43 over Somonauk Creek built?
It was built in 1953, making it 72 years old in 2025.
What condition is TR-43 over Somonauk Creek 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 April 2023.
How much traffic does TR-43 over Somonauk Creek carry?
About 100 vehicles per day (2020 count), of which roughly 9% are trucks.
How long is TR-43 over Somonauk Creek?
The structure is 105 ft (32 m) long with a longest span of 39 ft (11.9 m) and a deck 22 ft wide.
Who owns TR-43 over Somonauk Creek?
It is owned by the Town or Township Highway Agency.