US Bridges

Il 59 NB over I- 55

Good

Will County, Illinois · 1 M N of I-80 · Structure no. 099466600000000

Built
2021
4 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
330 ft
2 main spans
Daily traffic
4,200
2024 count
Owner
State
State Highway Agency

About this bridge

Il 59 NB over I- 55 is a steel continuous stringer/multi-beam or girder carrying Il 59 NB over I- 55 in Will County, Illinois. It was built in 2021, so it is 4 years old, younger 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,200 vehicles a day, roughly 17% of them trucks, projected to reach 5,446 by 2046. The structure is 330 ft (100.7 m) long and 51 ft wide.

Location

Open in Google Maps
CarriesIl 59 NB
CrossesI- 55
Location1 M N of I-80
CountyWill County
StateIllinois
Coordinates41.50212, -88.19773
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation9: Superior to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.6 US tons
Inventory rating57.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length330 ft (100.7 m)
Longest span167 ft (50.9 m)
Deck width51 ft (15.4 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,200 (2024)
Projected traffic5,446 by 2046
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Il 59 NB over I- 55 built?

It was built in 2021, making it 4 years old in 2025.

What condition is Il 59 NB over I- 55 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 September 2024.

How much traffic does Il 59 NB over I- 55 carry?

About 4,200 vehicles per day (2024 count), of which roughly 17% are trucks.

How long is Il 59 NB over I- 55?

The structure is 330 ft (100.7 m) long with a longest span of 167 ft (50.9 m) and a deck 51 ft wide.

Who owns Il 59 NB over I- 55?

It is owned by the State Highway Agency.