Structure 19000700000000 · DeKalb County, IL

Il 23 over Drainage Ditch

Carries Il 23 over Drainage Ditch, 2.4 Mi S Of I88.

Overall conditionFair

Set by its lowest-rated component: Deck and Substructure at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT56 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 5/9 · sets the rating

56 ft end to end, longest span 28 ft. 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 box-beam bridge.

Built1926rebuilt 2006
Length55.8 ft17 m
Daily traffic3,950counted 2023
Last inspectedMarch 2023every 24 months

Location

StateIllinois
CountyDeKalb
Location2.4 Mi S Of I88
CarriesIl 23
CrossesDrainage Ditch
Coordinates41.86894, -88.75379

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length55.8 ft (17 m)
Max Span27.9 ft (8.5 m)
Deck Width44.0 ft (13.4 m)
Deck Area227.8 sq m
Main Spans2
Year Built1926 (reconstructed 2006)

Traffic

Avg Daily Traffic3,950 (2023)
Truck Traffic12%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number019000700000000

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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