Structure 82025200000000 · St. Clair County, IL

I-55/64WB Mainlne" over Uprr Il 3 Ramp Uprr Uprr

Carries I-55/64WB Mainlne" over Uprr Il 3 Ramp Uprr Uprr, Pier Bc1-> Abut B31.

Overall conditionGood

Set by its lowest-rated component: Deck and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT2,992 FT OVERALL500 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

2,992 ft end to end, longest span 138 ft: about 8.3 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 multi-beam bridge.

Built199531 years old
Length2992.1 ft912 m
Daily traffic30,700counted 2024
Last inspectedMay 2023every 24 months

Location

StateIllinois
CountySt. Clair
LocationPier Bc1-> Abut B31
CarriesI-55/64WB Mainlne"
CrossesUprr Il 3 Ramp Uprr Uprr
Coordinates38.61634, -90.17656

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length2992.1 ft (912 m)
Max Span138.1 ft (42.1 m)
Deck Width33.5 ft (10.2 m)
Deck Area9302.4 sq m
Main Spans28
Year Built1995

Traffic

Avg Daily Traffic30,700 (2024)
Truck Traffic14%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number082025200000000

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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