US Bridges

I-90 Skyway over 75th ST & Grnwood Av

Fair

Cook County, Illinois · 2 M SE I94 P7C · Structure no. 016644000000000

Built
1958
67 years old, rebuilt 2002
Condition
Fair
inspected August 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
404 ft
2 main spans
Daily traffic
28,700
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

I-90 Skyway over 75th ST & Grnwood Av is a steel continuous stringer/multi-beam or girder carrying I-90 Skyway over 75th ST & Grnwood Av in Cook County, Illinois. It was built in 1958 and reconstructed in 2002, 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 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 28,700 vehicles a day, roughly 16% of them trucks, projected to reach 28,987 by 2046. The structure is 404 ft (123 m) long and 94 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesI-90 Skyway
Crosses75th ST & Grnwood Av
Location2 M SE I94 P7C
RouteInterstate 90
CountyCook County
StateIllinois
Coordinates41.75864, -87.59818
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 inspectionAugust 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length404 ft (123 m)
Longest span200 ft (61 m)
Deck width94 ft (28.8 m)
Roadway width88 ft (26.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,700 (2020)
Projected traffic28,987 by 2046
Trucks16%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$5.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 Skyway over 75th ST & Grnwood Av built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 2002.

What condition is I-90 Skyway over 75th ST & Grnwood Av 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 August 2022.

How much traffic does I-90 Skyway over 75th ST & Grnwood Av carry?

About 28,700 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I-90 Skyway over 75th ST & Grnwood Av?

The structure is 404 ft (123 m) long with a longest span of 200 ft (61 m) and a deck 94 ft wide.

Who owns I-90 Skyway over 75th ST & Grnwood Av?

It is owned by the City or Municipal Highway Agency.