Structure 22996800000000 · DuPage County, IL

Finley RD over I-88 & I-355

Carries Finley RD over I-88 & I-355, 0.2 M.n. Of Us-34.

Overall conditionFair

Set by its lowest-rated component: Deck and Superstructure at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT550 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

550 ft end to end, longest span 159 ft: about 1.5 football fields. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a segmental box-girder bridge.

Built198937 years old
Length549.9 ft167.6 m
Daily traffic8,700counted 2024
Last inspectedJuly 2024every 24 months

Location

StateIllinois
CountyDuPage
Location0.2 M.n. Of Us-34
CarriesFinley RD
CrossesI-88 & I-355
Coordinates41.81032, -88.03618

Physical Characteristics

MaterialPrestressed Concrete
DesignSegmental Box Girder
Total Length549.9 ft (167.6 m)
Max Span159.4 ft (48.6 m)
Deck Width28.9 ft (8.8 m)
Deck Area1474.9 sq m
Main Spans6
Year Built1989

Traffic

Avg Daily Traffic8,700 (2024)
Truck Traffic3%
Lanes On Bridge2
Lanes Under Bridge14

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number022996800000000

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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