Structure 82004100000000 · St. Clair County, IL

Il 15 over Nsrr Icrr

Carries Il 15 over Nsrr Icrr, .70mi E Jct Il 157.

Overall conditionFair

Set by its lowest-rated component: Superstructure at 5 of 9.

How ratings work
Deck7/9 · Good
Superstructuresets the rating5/9 · Fair
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT320 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 5/9 · sets the ratingSubstructure 7/9

320 ft end to end, longest span 88 ft: about 4 semi-trucks nose to tail. 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.

Built1940rebuilt 1985
Length319.9 ft97.5 m
Daily traffic28,700counted 2023
Last inspectedMarch 2024every 24 months

Location

StateIllinois
CountySt. Clair
Location.70mi E Jct Il 157
CarriesIl 15
CrossesNsrr Icrr
Coordinates38.55975, -90.08285

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length319.9 ft (97.5 m)
Max Span87.9 ft (26.8 m)
Deck Width71.2 ft (21.7 m)
Deck Area2115.8 sq m
Main Spans4
Year Built1940 (reconstructed 1985)

Traffic

Avg Daily Traffic28,700 (2023)
Truck Traffic8%
Lanes On Bridge4

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number082004100000000

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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