Structure 38003300000000 · Iroquois County, IL

US 24 over Drainage Ditch

Carries US 24 over Drainage Ditch, 3.1 Miles E Of US 45.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT186 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

186 ft end to end, longest span 67 ft: about 3 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.

Built1954rebuilt 1996
Length186.0 ft56.7 m
Daily traffic3,200counted 2023
Last inspectedJanuary 2021every 48 months

Location

StateIllinois
CountyIroquois
Location3.1 Miles E Of US 45
CarriesUS 24
CrossesDrainage Ditch
Coordinates40.76832, -87.91984

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length186.0 ft (56.7 m)
Max Span66.9 ft (20.4 m)
Deck Width43.0 ft (13.1 m)
Deck Area742.8 sq m
Main Spans3
Year Built1954 (reconstructed 1996)

Traffic

Avg Daily Traffic3,200 (2023)
Truck Traffic21%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2021
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number038003300000000

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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