US Bridges

St. Clair ST over Lower St. Clair ST

Fair

Cook County, Illinois · 200E.-400N. to 500N. · Structure no. 016650900000000

Built
1992
33 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
611 ft
13 main spans
Daily traffic
—
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

St. Clair ST over Lower St. Clair ST is a steel stringer/multi-beam or girder carrying St. Clair ST over Lower St. Clair ST 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.

No traffic count is recorded. The structure is 611 ft (186.2 m) long and 160 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSt. Clair ST
CrossesLower St. Clair ST
Location200E.-400N. to 500N.
RouteCity Street 0
CountyCook County
StateIllinois
Coordinates41.89093, -87.62265
Functional classUrban Local

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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans13
Design loadHS 20
Structure length611 ft (186.2 m)
Longest span65 ft (19.8 m)
Deck width160 ft (48.8 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic—
Projected traffic1,515 by 2046
Trucks0%
Lanes on structure2
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was St. Clair ST over Lower St. Clair ST built?

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

What condition is St. Clair ST over Lower St. Clair ST 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 St. Clair ST over Lower St. Clair ST carry?

No traffic count is recorded for this structure.

How long is St. Clair ST over Lower St. Clair ST?

The structure is 611 ft (186.2 m) long with a longest span of 65 ft (19.8 m) and a deck 160 ft wide.

Who owns St. Clair ST over Lower St. Clair ST?

It is owned by the City or Municipal Highway Agency.