US Bridges

Il 43 NB over US 41 SB

Good

Lake County, Illinois · 0.25 N of Il 120 · Structure no. 049008700000000

Built
1957
68 years old, rebuilt 2015
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
266 ft
3 main spans
Daily traffic
9,450
2023 count
Owner
State
State Highway Agency

About this bridge

Il 43 NB over US 41 SB is a steel continuous stringer/multi-beam or girder carrying Il 43 NB over US 41 SB in Lake County, Illinois. It was built in 1957 and reconstructed in 2015, 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 9,450 vehicles a day, roughly 8% of them trucks, projected to reach 8,838 by 2046. The structure is 266 ft (81.1 m) long and 31 ft wide.

CarriesIl 43 NB
CrossesUS 41 SB
Location0.25 N of Il 120
RouteState Highway 43
Coordinates42.35184, -87.89453
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating107.1 US tons
Inventory rating61.4 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length266 ft (81.1 m)
Longest span104 ft (31.7 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,450 (2023)
Projected traffic8,838 by 2046
Trucks8%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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$1.8 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Il 43 NB over US 41 SB built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2015.

What condition is Il 43 NB over US 41 SB 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 August 2023.

How much traffic does Il 43 NB over US 41 SB carry?

About 9,450 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Il 43 NB over US 41 SB?

The structure is 266 ft (81.1 m) long with a longest span of 104 ft (31.7 m) and a deck 31 ft wide.

Who owns Il 43 NB over US 41 SB?

It is owned by the State Highway Agency.