US Bridges

I- 55 EB to Ryan N over I- 55 Stevenson

Fair

Cook County, Illinois · 0.1 M E I-94 · Structure no. 016105900000000

Built
1964
61 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,174 ft
14 main spans
Daily traffic
32,300
2024 count
Owner
State
State Highway Agency

About this bridge

I- 55 EB to Ryan N over I- 55 Stevenson is a steel continuous stringer/multi-beam or girder carrying I- 55 EB to Ryan N over I- 55 Stevenson in Cook County, Illinois. It was built in 1964, so it is 61 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 32,300 vehicles a day, roughly 8% of them trucks, projected to reach 18,786 by 2046. The structure is 1,174 ft (357.8 m) long and 29 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesI- 55 EB to Ryan N
CrossesI- 55 Stevenson
Location0.1 M E I-94
CountyCook County
StateIllinois
Coordinates41.84786, -87.64233
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.6 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans14
Design loadUnknown
Structure length1,174 ft (357.8 m)
Longest span80 ft (24.4 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,300 (2024)
Projected traffic18,786 by 2046
Trucks8%
Lanes on structure1
Traffic directionOne-way traffic
CarriesThird level (interchange)
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I- 55 EB to Ryan N over I- 55 Stevenson built?

It was built in 1964, making it 61 years old in 2025.

What condition is I- 55 EB to Ryan N over I- 55 Stevenson 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 I- 55 EB to Ryan N over I- 55 Stevenson carry?

About 32,300 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is I- 55 EB to Ryan N over I- 55 Stevenson?

The structure is 1,174 ft (357.8 m) long with a longest span of 80 ft (24.4 m) and a deck 29 ft wide.

Who owns I- 55 EB to Ryan N over I- 55 Stevenson?

It is owned by the State Highway Agency.