Structure 47010200000000 · Kendall County, IL

US 34 over Blackberry Creek

Carries US 34 over Blackberry Creek, 0.51 Mi W Of Ill 47.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 8 of 9.

How ratings work
Decksets the rating8/9 · Very Good
Superstructuresets the rating8/9 · Very Good
Substructuresets the rating8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT147 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 8/9

147 ft end to end, longest span 83 ft: about 2 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.

Built20197 years old
Length146.7 ft44.7 m
Daily traffic22,400counted 2023
Last inspectedMarch 2021every 48 months

Location

StateIllinois
CountyKendall
Location0.51 Mi W Of Ill 47
CarriesUS 34
CrossesBlackberry Creek
Coordinates41.65896, -88.45206

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length146.7 ft (44.7 m)
Max Span83.3 ft (25.4 m)
Deck Width81.0 ft (24.7 m)
Deck Area1104.1 sq m
Main Spans2
Year Built2019

Traffic

Avg Daily Traffic22,400 (2023)
Truck Traffic6%
Lanes On Bridge4

Inspection & Ownership

Last InspectionMarch 2021
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number047010200000000

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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