I- 55 WB Rmp IL171 over Des Plaines River
PoorCook County, Illinois · 1.3 M SW Il 43 · Structure no. 016098700000000
- Built
- 1963
- 62 years old, rebuilt 1994
- Condition
- Poor
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 873 ft
- 8 main spans
- Daily traffic
- 5,300
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I- 55 WB Rmp IL171 over Des Plaines River is a steel continuous stringer/multi-beam or girder carrying I- 55 WB Rmp IL171 over Des Plaines River in Cook County, Illinois. It was built in 1963 and reconstructed in 1994, so it is 62 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 5,300 vehicles a day, roughly 9% of them trucks, projected to reach 5,301 by 2046. The structure is 873 ft (266.1 m) long and 29 ft wide.
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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I- 55 WB Rmp IL171 over Des Plaines River built?
It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1994.
What condition is I- 55 WB Rmp IL171 over Des Plaines River 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 November 2024.
How much traffic does I- 55 WB Rmp IL171 over Des Plaines River carry?
About 5,300 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is I- 55 WB Rmp IL171 over Des Plaines River?
The structure is 873 ft (266.1 m) long with a longest span of 111 ft (33.8 m) and a deck 29 ft wide.
Who owns I- 55 WB Rmp IL171 over Des Plaines River?
It is owned by the State Highway Agency.