Structure 19401400000000 · DeKalb County, IL

Irene RD over S Br Kishwaukee Riv.

Carries Irene RD over S Br Kishwaukee Riv., 3310 N 240 E.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT266 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

266 ft end to end, longest span 65 ft: about 4 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.

Built200422 years old
Length265.7 ft81 m
Daily traffic625counted 2021
Last inspectedApril 2022every 48 months

Location

StateIllinois
CountyDeKalb
Location3310 N 240 E
CarriesIrene RD
CrossesS Br Kishwaukee Riv.
Coordinates42.11008, -88.90057

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length265.7 ft (81 m)
Max Span65.3 ft (19.9 m)
Deck Width29.9 ft (9.1 m)
Deck Area737.1 sq m
Main Spans4
Year Built2004

Traffic

Avg Daily Traffic625 (2021)
Truck Traffic48%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2022
Inspection FrequencyEvery 48 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number019401400000000

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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