US Bridges

I-90WB to NB Stony over Conrail & AMTRAK

Fair

Cook County, Illinois · 0.13 M S 79th P7C · Structure no. 016647900000000

Built
1958
67 years old, rebuilt 1998
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
333 ft
3 main spans
Daily traffic
4,000
2000 count
Owner
City
City or Municipal Highway Agency

About this bridge

I-90WB to NB Stony over Conrail & AMTRAK is a steel stringer/multi-beam or girder carrying I-90WB to NB Stony over Conrail & AMTRAK in Cook County, Illinois. It was built in 1958 and reconstructed in 1998, so it is 67 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 4,000 vehicles a day, projected to reach 4,040 by 2046. The structure is 333 ft (101.6 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-90WB to NB Stony
CrossesConrail & AMTRAK
Location0.13 M S 79th P7C
CountyCook County
StateIllinois
Coordinates41.75149, -87.58557
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating59 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length333 ft (101.6 m)
Longest span113 ft (34.4 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2000)
Projected traffic4,040 by 2046
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$1.4 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90WB to NB Stony over Conrail & AMTRAK built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1998.

What condition is I-90WB to NB Stony over Conrail & AMTRAK 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 2023.

How much traffic does I-90WB to NB Stony over Conrail & AMTRAK carry?

About 4,000 vehicles per day (2000 count).

How long is I-90WB to NB Stony over Conrail & AMTRAK?

The structure is 333 ft (101.6 m) long with a longest span of 113 ft (34.4 m) and a deck 31 ft wide.

Who owns I-90WB to NB Stony over Conrail & AMTRAK?

It is owned by the City or Municipal Highway Agency.