Structure 99007900000000 · Will County, IL

Il 1 over Trim Creek

Carries Il 1 over Trim Creek, 4.5 M S Of Il 394.

Overall conditionFair

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

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating5/9 · Fair
Substructure6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT53 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 5/9 · sets the ratingSubstructure 6/9

53 ft end to end. 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 or the layout of the shorter spans, so those are drawn as typical for a tee-beam bridge.

Built1920rebuilt 1949
Length53.1 ft16.2 m
Daily traffic4,800counted 2023
Last inspectedMarch 2024every 24 months

Location

StateIllinois
CountyWill
Location4.5 M S Of Il 394
CarriesIl 1
CrossesTrim Creek
Coordinates41.32475, -87.62126

Physical Characteristics

MaterialConcrete
DesignTee Beam
Total Length53.1 ft (16.2 m)
Max Span50.9 ft (15.5 m)
Deck Width40.4 ft (12.3 m)
Deck Area199.3 sq m
Main Spans1
Year Built1920 (reconstructed 1949)

Traffic

Avg Daily Traffic4,800 (2023)
Truck Traffic34%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number099007900000000

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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