US Bridges

31st ST over I- 90 94 Ryan & Cta

Fair

Cook County, Illinois · 0.9 M S I-55 · Structure no. 016115900000000

Built
1961
64 years old, rebuilt 2001
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
397 ft
7 main spans
Daily traffic
7,550
2022 count
Owner
State
State Highway Agency

About this bridge

31st ST over I- 90 94 Ryan & Cta is a steel continuous stringer/multi-beam or girder carrying 31st ST over I- 90 94 Ryan & Cta in Cook County, Illinois. It was built in 1961 and reconstructed in 2001, so it is 64 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 7,550 vehicles a day, roughly 5% of them trucks, projected to reach 9,191 by 2046. The structure is 397 ft (121.1 m) long and 88 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries31st ST
CrossesI- 90 94 Ryan & Cta
Location0.9 M S I-55
CountyCook County
StateIllinois
Coordinates41.83824, -87.63151
Functional classUrban Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating49.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length397 ft (121.1 m)
Longest span76 ft (23.1 m)
Deck width88 ft (26.8 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,550 (2022)
Projected traffic9,191 by 2046
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$3.8 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was 31st ST over I- 90 94 Ryan & Cta built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2001.

What condition is 31st ST over I- 90 94 Ryan & Cta 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 2024.

How much traffic does 31st ST over I- 90 94 Ryan & Cta carry?

About 7,550 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is 31st ST over I- 90 94 Ryan & Cta?

The structure is 397 ft (121.1 m) long with a longest span of 76 ft (23.1 m) and a deck 88 ft wide.

Who owns 31st ST over I- 90 94 Ryan & Cta?

It is owned by the State Highway Agency.