US Bridges

Illinois ST over Lower Level Illinois

Fair

Cook County, Illinois · 500N-200E to 100E · Structure no. 016651000000000

Built
1992
33 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
487 ft
12 main spans
Daily traffic
8,150
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Illinois ST over Lower Level Illinois is a steel stringer/multi-beam or girder carrying Illinois ST over Lower Level Illinois in Cook County, Illinois. It was built in 1992, so it is 33 years old, younger 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 8,150 vehicles a day, roughly 9% of them trucks, projected to reach 10,504 by 2046. The structure is 487 ft (148.4 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIllinois ST
CrossesLower Level Illinois
Location500N-200E to 100E
CountyCook County
StateIllinois
Coordinates41.89093, -87.62265
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.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating34.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans12
Design loadHS 20
Structure length487 ft (148.4 m)
Longest span64 ft (19.5 m)
Deck width73 ft (22.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,150 (2022)
Projected traffic10,504 by 2046
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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$5.7 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Illinois ST over Lower Level Illinois built?

It was built in 1992, making it 33 years old in 2025.

What condition is Illinois ST over Lower Level Illinois 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 October 2023.

How much traffic does Illinois ST over Lower Level Illinois carry?

About 8,150 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Illinois ST over Lower Level Illinois?

The structure is 487 ft (148.4 m) long with a longest span of 64 ft (19.5 m) and a deck 73 ft wide.

Who owns Illinois ST over Lower Level Illinois?

It is owned by the City or Municipal Highway Agency.