Michigan Ave over Main Br Chicago Riv
PoorCook County, Illinois · 365 N Mchigan Ave · Structure no. 016603500000000
- Built
- 1920
- 105 years old, rebuilt 1993
- Condition
- Poor
- inspected September 2023
- Type
- Movable - Bascule
- Steel
- Length
- 367 ft
- 1 main span
- Daily traffic
- 24,300
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Michigan Ave over Main Br Chicago Riv is a steel movable - bascule carrying Michigan Ave over Main Br Chicago Riv in Cook County, Illinois. It was built in 1920 and reconstructed in 1993, so it is 105 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 3 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 24,300 vehicles a day, roughly 4% of them trucks, projected to reach 28,583 by 2046. The structure is 367 ft (112 m) long and 92 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Michigan Ave over Main Br Chicago Riv built?
It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1993.
What condition is Michigan Ave over Main Br Chicago Riv 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 September 2023.
How much traffic does Michigan Ave over Main Br Chicago Riv carry?
About 24,300 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Michigan Ave over Main Br Chicago Riv?
The structure is 367 ft (112 m) long with a longest span of 256 ft (78 m) and a deck 92 ft wide.
Who owns Michigan Ave over Main Br Chicago Riv?
It is owned by the City or Municipal Highway Agency.