US Bridges

I- 55 NB to I-355 over I- 55

Fair

DuPage County, Illinois · 1 M W of Lemont RD · Structure no. 022200600000000

Built
2007
18 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
410 ft
2 main spans
Daily traffic
28,200
2024 count
Owner
State
State Highway Agency

About this bridge

I- 55 NB to I-355 over I- 55 is a steel continuous stringer/multi-beam or girder carrying I- 55 NB to I-355 over I- 55 in DuPage County, Illinois. It was built in 2007, so it is 18 years old, younger 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 28,200 vehicles a day, roughly 10% of them trucks, projected to reach 28,381 by 2046. The structure is 410 ft (125.1 m) long and 37 ft wide.

Location

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CarriesI- 55 NB to I-355
CrossesI- 55
Location1 M W of Lemont RD
CountyDuPage County
StateIllinois
Coordinates41.70557, -88.02827
Functional classUrban Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
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 alignment8: Equal to present desirable criteria
Operating rating80.4 US tons
Inventory rating45.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length410 ft (125.1 m)
Longest span180 ft (54.8 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deck17 ft (5 m)

Traffic and service

Average daily traffic28,200 (2024)
Projected traffic28,381 by 2046
Trucks10%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a toll 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 I- 55 NB to I-355 over I- 55 built?

It was built in 2007, making it 18 years old in 2025.

What condition is I- 55 NB to I-355 over I- 55 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 2024.

How much traffic does I- 55 NB to I-355 over I- 55 carry?

About 28,200 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is I- 55 NB to I-355 over I- 55?

The structure is 410 ft (125.1 m) long with a longest span of 180 ft (54.8 m) and a deck 37 ft wide.

Who owns I- 55 NB to I-355 over I- 55?

It is owned by the State Highway Agency.