US Bridges

I-355 NB & SB over Finley RD & Ramp

Fair

DuPage County, Illinois · 0.8 M.N. of US-34 · Structure no. 022996600000000

Built
1989
36 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
526 ft
4 main spans
Daily traffic
104,200
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-355 NB & SB over Finley RD & Ramp is a steel stringer/multi-beam or girder carrying I-355 NB & SB over Finley RD & Ramp in DuPage County, Illinois. It was built in 1989, so it is 36 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 5 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 104,200 vehicles a day, roughly 14% of them trucks, projected to reach 59,590 by 2046. The structure is 526 ft (160.3 m) long and 139 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesI-355 NB & SB
CrossesFinley RD & Ramp
Location0.8 M.N. of US-34
RouteInterstate 355
CountyDuPage County
StateIllinois
Coordinates41.82076, -88.0284
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.1 US tons
Inventory rating54.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length526 ft (160.3 m)
Longest span185 ft (56.4 m)
Deck width139 ft (42.5 m)
Roadway width133 ft (40.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic104,200 (2023)
Projected traffic59,590 by 2046
Trucks14%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
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 NB & SB over Finley RD & Ramp built?

It was built in 1989, making it 36 years old in 2025.

What condition is I-355 NB & SB over Finley RD & Ramp 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 September 2024.

How much traffic does I-355 NB & SB over Finley RD & Ramp carry?

About 104,200 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is I-355 NB & SB over Finley RD & Ramp?

The structure is 526 ft (160.3 m) long with a longest span of 185 ft (56.4 m) and a deck 139 ft wide.

Who owns I-355 NB & SB over Finley RD & Ramp?

It is owned by the State Toll Authority.