Il 58 (dempster S over N Br Chicago River
FairCook County, Illinois · 0.6 M E Il 43 · Structure no. 016094200000000
- Built
- 1966
- 59 years old, rebuilt 1981
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 77 ft
- 1 main span
- Daily traffic
- 34,900
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Il 58 (dempster S over N Br Chicago River is a prestressed concrete stringer/multi-beam or girder carrying Il 58 (dempster S over N Br Chicago River in Cook County, Illinois. It was built in 1966 and reconstructed in 1981, so it is 59 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 6 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 34,900 vehicles a day, roughly 3% of them trucks, projected to reach 32,926 by 2046. The structure is 77 ft (23.5 m) long and 100 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 58 (dempster S over N Br Chicago River built?
It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1981.
What condition is Il 58 (dempster S over N Br Chicago River 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 58 (dempster S over N Br Chicago River carry?
About 34,900 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is Il 58 (dempster S over N Br Chicago River?
The structure is 77 ft (23.5 m) long with a longest span of 74 ft (22.6 m) and a deck 100 ft wide.
Who owns Il 58 (dempster S over N Br Chicago River?
It is owned by the State Highway Agency.