US Bridges

County Line RD over I- 55 Stevenson

Fair

Cook County, Illinois · 2.6 M W US 45 · Structure no. 016058700000000

Built
1959
66 years old, rebuilt 2014
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
298 ft
4 main spans
Daily traffic
18,200
2022 count
Owner
State
State Highway Agency

About this bridge

County Line RD over I- 55 Stevenson is a steel continuous stringer/multi-beam or girder carrying County Line RD over I- 55 Stevenson in Cook County, Illinois. It was built in 1959 and reconstructed in 2014, so it is 66 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 18,200 vehicles a day, roughly 3% of them trucks, projected to reach 20,907 by 2046. The structure is 298 ft (90.8 m) long and 100 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty Line RD
CrossesI- 55 Stevenson
Location2.6 M W US 45
CountyCook County
StateIllinois
Coordinates41.75823, -87.91592
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.3 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length298 ft (90.8 m)
Longest span93 ft (28.3 m)
Deck width100 ft (30.4 m)
Roadway width93 ft (28.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,200 (2022)
Projected traffic20,907 by 2046
Trucks3%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.7 mi (6 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$3.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Line RD over I- 55 Stevenson built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2014.

What condition is County Line RD over I- 55 Stevenson 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 2024.

How much traffic does County Line RD over I- 55 Stevenson carry?

About 18,200 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is County Line RD over I- 55 Stevenson?

The structure is 298 ft (90.8 m) long with a longest span of 93 ft (28.3 m) and a deck 100 ft wide.

Who owns County Line RD over I- 55 Stevenson?

It is owned by the State Highway Agency.