US Bridges

IL-390 (wb) over Prospect Ave

Fair

DuPage County, Illinois · 1.3 MI E of I 290 · Structure no. 022900200000000

Built
2017
8 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
228 ft
2 main spans
Daily traffic
27,100
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

IL-390 (wb) over Prospect Ave is a prestressed concrete continuous stringer/multi-beam or girder carrying IL-390 (wb) over Prospect Ave in DuPage County, Illinois. It was built in 2017, so it is 8 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 27,100 vehicles a day, roughly 13% of them trucks, projected to reach 13,332 by 2046. The structure is 228 ft (69.4 m) long and 67 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesIL-390 (wb)
CrossesProspect Ave
Location1.3 MI E of I 290
RouteState Highway 390
CountyDuPage County
StateIllinois
Coordinates41.98326, -87.99899
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length228 ft (69.4 m)
Longest span124 ft (37.9 m)
Deck width67 ft (20.4 m)
Roadway width64 ft (19.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,100 (2023)
Projected traffic13,332 by 2046
Trucks13%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 IL-390 (wb) over Prospect Ave built?

It was built in 2017, making it 8 years old in 2025.

What condition is IL-390 (wb) over Prospect Ave 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 IL-390 (wb) over Prospect Ave carry?

About 27,100 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is IL-390 (wb) over Prospect Ave?

The structure is 228 ft (69.4 m) long with a longest span of 124 ft (37.9 m) and a deck 67 ft wide.

Who owns IL-390 (wb) over Prospect Ave?

It is owned by the State Toll Authority.