Structure 58012600000000 · Macon County, IL

Fap 322 (us 51) S. over Willow Branch Creek

Carries Fap 322 (us 51) S. over Willow Branch Creek, 2 Mi S Of Macon.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT83 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 7/9

83 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.

Built200125 years old
Length82.7 ft25.2 m
Daily traffic5,700counted 2023
Last inspectedSeptember 2021every 48 months

Location

StateIllinois
CountyMacon
Location2 Mi S Of Macon
CarriesFap 322 (us 51) S.
CrossesWillow Branch Creek
Coordinates39.67841, -89.00679

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length82.7 ft (25.2 m)
Max Span77.8 ft (23.7 m)
Deck Width42.7 ft (13 m)
Deck Area327.6 sq m
Main Spans1
Year Built2001

Traffic

Avg Daily Traffic5,700 (2023)
Truck Traffic13%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2021
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number058012600000000

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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