US Bridges

I-355 SB over I-55

Fair

Will County, Illinois · 1.3M S of Boughton · Structure no. 099033600000000

Built
2007
18 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
357 ft
2 main spans
Daily traffic
41,950
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-355 SB over I-55 is a steel continuous stringer/multi-beam or girder carrying I-355 SB over I-55 in Will 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 41,950 vehicles a day, roughly 16% of them trucks, projected to reach 47,448 by 2046. The structure is 357 ft (108.7 m) long and 100 ft wide.

Location

Open in Google Maps
CarriesI-355 SB
CrossesI-55
Location1.3M S of Boughton
RouteInterstate 355
CountyWill County
StateIllinois
Coordinates41.70389, -88.03082
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.4 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 length357 ft (108.7 m)
Longest span149 ft (45.3 m)
Deck width100 ft (30.4 m)
Roadway width100 ft (30.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,950 (2023)
Projected traffic47,448 by 2046
Trucks16%
Lanes on structure4
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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-355 SB over I-55 built?

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

What condition is I-355 SB 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-355 SB over I-55 carry?

About 41,950 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is I-355 SB over I-55?

The structure is 357 ft (108.7 m) long with a longest span of 149 ft (45.3 m) and a deck 100 ft wide.

Who owns I-355 SB over I-55?

It is owned by the State Toll Authority.