Structure 32009900000000 · Grundy County, IL

Il 47 Fap 326 over Il Riv.& I & M Canal

Carries Il 47 Fap 326 over Il Riv.& I & M Canal, Appr.1.23mi S /us 6.

Overall conditionFair

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

How ratings work
Deck6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,730 FT OVERALL250 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 7/9Substructure 5/9 · sets the rating

1,730 ft end to end, longest span 404 ft: about 4.8 football fields. 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.

Built200323 years old
Length1730.0 ft527.3 m
Daily traffic18,100counted 2023
Last inspectedOctober 2024every 24 months

Location

StateIllinois
CountyGrundy
LocationAppr.1.23mi S /us 6
CarriesIl 47 Fap 326
CrossesIl Riv.& I & M Canal
Coordinates41.35574, -88.42155

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length1730.0 ft (527.3 m)
Max Span403.5 ft (123 m)
Deck Width76.4 ft (23.3 m)
Deck Area12286.1 sq m
Main Spans5
Year Built2003

Traffic

Avg Daily Traffic18,100 (2023)
Truck Traffic9%
Lanes On Bridge4

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number032009900000000

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.

Nearby Bridges