US Bridges

79th ST over I- 94 Ryan & Cta

Fair

Cook County, Illinois · 2 M N US 12 · Structure no. 016114400000000

Built
1959
66 years old, rebuilt 1999
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
193 ft
3 main spans
Daily traffic
18,100
2022 count
Owner
State
State Highway Agency

About this bridge

79th ST over I- 94 Ryan & Cta is a steel continuous stringer/multi-beam or girder carrying 79th ST over I- 94 Ryan & Cta in Cook County, Illinois. It was built in 1959 and reconstructed in 1999, so it is 66 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 18,100 vehicles a day, roughly 6% of them trucks, projected to reach 14,039 by 2046. The structure is 193 ft (58.8 m) long and 107 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries79th ST
CrossesI- 94 Ryan & Cta
Location2 M N US 12
CountyCook County
StateIllinois
Coordinates41.75096, -87.62544
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 rating78.9 US tons
Inventory rating47.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length193 ft (58.8 m)
Longest span76 ft (23.1 m)
Deck width107 ft (32.6 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,100 (2022)
Projected traffic14,039 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was 79th ST over I- 94 Ryan & Cta built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1999.

What condition is 79th ST over I- 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 July 2024.

How much traffic does 79th ST over I- 94 Ryan & Cta carry?

About 18,100 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is 79th ST over I- 94 Ryan & Cta?

The structure is 193 ft (58.8 m) long with a longest span of 76 ft (23.1 m) and a deck 107 ft wide.

Who owns 79th ST over I- 94 Ryan & Cta?

It is owned by the State Highway Agency.