Structure 19202100000000 · DeKalb County, IL

Il 64 Fap 307 over Ditch

Carries Il 64 Fap 307 over Ditch, 1.04 Mi E Of Il 23n.

Overall conditionGood

Set by its lowest-rated component: Culvert at 8 of 9.

How ratings work
Culvertsets the rating8/9 · Very Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT28 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 8/9

A culvert 28 ft across with 3 openings. 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, so those are drawn as typical for a culvert.

Built200224 years old
Length28.2 ft8.6 m
Daily traffic7,700counted 2023
Last inspectedMarch 2023every 48 months

Location

StateIllinois
CountyDeKalb
Location1.04 Mi E Of Il 23n
CarriesIl 64 Fap 307
CrossesDitch
Coordinates41.98510, -88.66490

Physical Characteristics

MaterialConcrete
DesignCulvert
Total Length28.2 ft (8.6 m)
Max Span8.2 ft (2.5 m)
Deck Area73.1 sq m
Main Spans3
Year Built2002

Traffic

Avg Daily Traffic7,700 (2023)
Truck Traffic7%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number019202100000000

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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