Structure 101205000000000 · Winnebago County, IL

Il 251 over Drainage Ditch

Carries Il 251 over Drainage Ditch, 1.5 Mi S Us20 Bypass.

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 overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT52 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 8/9

A culvert 52 ft across with 4 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.

Built20197 years old
Length52.2 ft15.9 m
Daily traffic7,600counted 2023
Last inspectedNovember 2021every 48 months

Location

StateIllinois
CountyWinnebago
Location1.5 Mi S Us20 Bypass
CarriesIl 251
CrossesDrainage Ditch
Coordinates42.20118, -89.07241

Physical Characteristics

MaterialConcrete
DesignCulvert
Total Length52.2 ft (15.9 m)
Max Span12.8 ft (3.9 m)
Deck Width266.1 ft (81.1 m)
Deck Area1289.5 sq m
Main Spans4
Year Built2019

Traffic

Avg Daily Traffic7,600 (2023)
Truck Traffic7%
Lanes On Bridge4

Inspection & Ownership

Last InspectionNovember 2021
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number101205000000000

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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