Structure 91311100000000 · Union County, IL

Ch 3 over Mill Creek

Carries Ch 3 over Mill Creek, 0.14m.e Of Ill 127.

Overall conditionFair

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

How ratings work
Deck6/9 · Satisfactory
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT115 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

115 ft end to end, longest span 38 ft. 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 channel-beam bridge.

Built197254 years old
Length115.2 ft35.1 m
Daily traffic250counted 2020
Last inspectedMarch 2023every 24 months

Location

StateIllinois
CountyUnion
Location0.14m.e Of Ill 127
CarriesCh 3
CrossesMill Creek
Coordinates37.34071, -89.24950

Physical Characteristics

MaterialConcrete
DesignChannel Beam
Total Length115.2 ft (35.1 m)
Max Span38.1 ft (11.6 m)
Deck Width29.9 ft (9.1 m)
Deck Area319.4 sq m
Main Spans3
Year Built1972

Traffic

Avg Daily Traffic250 (2020)
Truck Traffic13%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number091311100000000

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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