US Bridges

I-355 over I55 Rmp to NBI355

Fair

Will County, Illinois · 1.5M S of Boughton · Structure no. 099301100000000

Built
2007
18 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
121 ft
1 main span
Daily traffic
83,900
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-355 over I55 Rmp to NBI355 is a steel continuous stringer/multi-beam or girder carrying I-355 over I55 Rmp to NBI355 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 83,900 vehicles a day, roughly 16% of them trucks, projected to reach 94,896 by 2046. The structure is 121 ft (37 m) long and 48 ft wide.

Location

Open in Google Maps
CarriesI-355
CrossesI55 Rmp to NBI355
Location1.5M S of Boughton
RouteInterstate 355
CountyWill County
StateIllinois
Coordinates41.70233, -88.03053
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating100 US tons
Inventory rating60 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length121 ft (37 m)
Longest span119 ft (36.4 m)
Deck width48 ft (14.6 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic83,900 (2023)
Projected traffic94,896 by 2046
Trucks16%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkInterstate 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 over I55 Rmp to NBI355 built?

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

What condition is I-355 over I55 Rmp to NBI355 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 over I55 Rmp to NBI355 carry?

About 83,900 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is I-355 over I55 Rmp to NBI355?

The structure is 121 ft (37 m) long with a longest span of 119 ft (36.4 m) and a deck 48 ft wide.

Who owns I-355 over I55 Rmp to NBI355?

It is owned by the State Toll Authority.