US Bridges

51st ST over I- 90 94 Ryan & Cta

Fair

Cook County, Illinois · 3.2 M S I-55 · Structure no. 016115700000000

Built
1962
63 years old, rebuilt 2004
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
276 ft
5 main spans
Daily traffic
12,700
2022 count
Owner
State
State Highway Agency

About this bridge

51st ST over I- 90 94 Ryan & Cta is a steel continuous stringer/multi-beam or girder carrying 51st ST over I- 90 94 Ryan & Cta in Cook County, Illinois. It was built in 1962 and reconstructed in 2004, so it is 63 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 5 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 12,700 vehicles a day, roughly 6% of them trucks, projected to reach 8,636 by 2046. The structure is 276 ft (84.2 m) long and 95 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries51st ST
CrossesI- 90 94 Ryan & Cta
Location3.2 M S I-55
CountyCook County
StateIllinois
Coordinates41.8018, -87.63176
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating77.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length276 ft (84.2 m)
Longest span72 ft (21.9 m)
Deck width95 ft (29 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,700 (2022)
Projected traffic8,636 by 2046
Trucks6%
Lanes on structure2
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 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 51st ST over I- 90 94 Ryan & Cta built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2004.

What condition is 51st 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 September 2024.

How much traffic does 51st ST over I- 90 94 Ryan & Cta carry?

About 12,700 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is 51st ST over I- 90 94 Ryan & Cta?

The structure is 276 ft (84.2 m) long with a longest span of 72 ft (21.9 m) and a deck 95 ft wide.

Who owns 51st ST over I- 90 94 Ryan & Cta?

It is owned by the State Highway Agency.