US Bridges

Il 43 NB (harlem) over RR - Cn

Fair

Cook County, Illinois · 0.1 M S I-55 · Structure no. 016031800000000

Built
1931
94 years old, rebuilt 1990
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
218 ft
4 main spans
Daily traffic
39,000
2023 count
Owner
State
State Highway Agency

About this bridge

Il 43 NB (harlem) over RR - Cn is a steel continuous stringer/multi-beam or girder carrying Il 43 NB (harlem) over RR - Cn in Cook County, Illinois. It was built in 1931 and reconstructed in 1990, so it is 94 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 39,000 vehicles a day, roughly 10% of them trucks, projected to reach 21,564 by 2046. The structure is 218 ft (66.4 m) long and 55 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesIl 43 NB (harlem)
CrossesRR - Cn
Location0.1 M S I-55
RouteState Highway 43
CountyCook County
StateIllinois
Coordinates41.79814, -87.80208
Functional classUrban Other Principal 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating97.1 US tons
Inventory rating58.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length218 ft (66.4 m)
Longest span70 ft (21.3 m)
Deck width55 ft (16.9 m)
Roadway width49 ft (14.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic39,000 (2023)
Projected traffic21,564 by 2046
Trucks10%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

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$2.8 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 43 NB (harlem) over RR - Cn built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1990.

What condition is Il 43 NB (harlem) over RR - Cn 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 April 2023.

How much traffic does Il 43 NB (harlem) over RR - Cn carry?

About 39,000 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Il 43 NB (harlem) over RR - Cn?

The structure is 218 ft (66.4 m) long with a longest span of 70 ft (21.3 m) and a deck 55 ft wide.

Who owns Il 43 NB (harlem) over RR - Cn?

It is owned by the State Highway Agency.