Structure 47205100000000 · Kendall County, IL

US 34 over Rob Roy Creek

Carries US 34 over Rob Roy Creek, 2.05 M W Of Il 47.

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 overall8/9 · Very Good
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 2 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
Length28.2 ft8.6 m
Daily traffic18,700counted 2023
Last inspectedFebruary 2022every 48 months

Location

StateIllinois
CountyKendall
Location2.05 M W Of Il 47
CarriesUS 34
CrossesRob Roy Creek
Coordinates41.66143, -88.48162

Physical Characteristics

MaterialConcrete
DesignCulvert
Total Length28.2 ft (8.6 m)
Max Span13.1 ft (4 m)
Deck Width127.0 ft (38.7 m)
Deck Area332.8 sq m
Main Spans2
Year Built2019

Traffic

Avg Daily Traffic18,700 (2023)
Truck Traffic5%
Lanes On Bridge4

Inspection & Ownership

Last InspectionFebruary 2022
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number047205100000000

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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