US Bridges

Il 40 over I-88

Fair

Whiteside County, Illinois · 1 MI S US 30 · Structure no. 098008600000000

Built
1972
53 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
252 ft
2 main spans
Daily traffic
6,550
2021 count
Owner
State
State Highway Agency

About this bridge

Il 40 over I-88 is a steel continuous stringer/multi-beam or girder carrying Il 40 over I-88 in Whiteside County, Illinois. It was built in 1972, so it is 53 years old, older 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 6,550 vehicles a day, roughly 11% of them trucks, projected to reach 6,616 by 2046. The structure is 252 ft (76.7 m) long and 92 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesIl 40
CrossesI-88
Location1 MI S US 30
RouteState Highway 40
CountyWhiteside County
StateIllinois
Coordinates41.75125, -89.68958
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionOctober 2023
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 rating102.2 US tons
Inventory rating45.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length252 ft (76.7 m)
Longest span108 ft (32.9 m)
Deck width92 ft (28 m)
Roadway width71 ft (21.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,550 (2021)
Projected traffic6,616 by 2046
Trucks11%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free 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 Il 40 over I-88 built?

It was built in 1972, making it 53 years old in 2025.

What condition is Il 40 over I-88 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 October 2023.

How much traffic does Il 40 over I-88 carry?

About 6,550 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is Il 40 over I-88?

The structure is 252 ft (76.7 m) long with a longest span of 108 ft (32.9 m) and a deck 92 ft wide.

Who owns Il 40 over I-88?

It is owned by the State Highway Agency.