US Bridges

31st ST over Kilbourn Ave

Good

Cook County, Illinois · 0.5 M E Il 50 · Structure no. 016087200000000

Built
1957
68 years old, rebuilt 2009
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
176 ft
3 main spans
Daily traffic
9,350
2023 count
Owner
State
State Highway Agency

About this bridge

31st ST over Kilbourn Ave is a steel continuous stringer/multi-beam or girder carrying 31st ST over Kilbourn Ave in Cook County, Illinois. It was built in 1957 and reconstructed in 2009, so it is 68 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,350 vehicles a day, roughly 5% of them trucks, projected to reach 9,545 by 2046. The structure is 176 ft (53.6 m) long and 48 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries31st ST
CrossesKilbourn Ave
Location0.5 M E Il 50
CountyCook County
StateIllinois
Coordinates41.83676, -87.7369
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating82.5 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length176 ft (53.6 m)
Longest span67 ft (20.3 m)
Deck width48 ft (14.5 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,350 (2023)
Projected traffic9,545 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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$2.5 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was 31st ST over Kilbourn Ave built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2009.

What condition is 31st ST over Kilbourn Ave in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does 31st ST over Kilbourn Ave carry?

About 9,350 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is 31st ST over Kilbourn Ave?

The structure is 176 ft (53.6 m) long with a longest span of 67 ft (20.3 m) and a deck 48 ft wide.

Who owns 31st ST over Kilbourn Ave?

It is owned by the State Highway Agency.