Structure 60030400000000 · Madison County, IL

Il 255 NB (fap310n over Fas 1765 Seminary RD

Carries Il 255 NB (fap310n over Fas 1765 Seminary RD, 1.5mi S Seiler RD.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructure8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT110 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 8/9

110 ft end to end. Lengths and the car 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.

Built200620 years old
Length109.6 ft33.4 m
Daily traffic14,900counted 2023
Last inspectedNovember 2024every 24 months

Location

StateIllinois
CountyMadison
Location1.5mi S Seiler RD
CarriesIl 255 NB (fap310n
CrossesFas 1765 Seminary RD
Coordinates38.94807, -90.14164

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length109.6 ft (33.4 m)
Max Span109.6 ft (33.4 m)
Deck Width44.6 ft (13.6 m)
Deck Area454.2 sq m
Main Spans1
Year Built2006

Traffic

Avg Daily Traffic14,900 (2023)
Truck Traffic10%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number060030400000000

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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