Structure 59002100000000 · Macoupin County, IL

Ill 108 over Bear Creek

Carries Ill 108 over Bear Creek, 2.2mi E Jct Il 111.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT103 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 7/9

103 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 multi-beam bridge.

Built1929rebuilt 1985
Length103.3 ft31.5 m
Daily traffic1,350counted 2023
Last inspectedSeptember 2024every 24 months

Location

StateIllinois
CountyMacoupin
Location2.2mi E Jct Il 111
CarriesIll 108
CrossesBear Creek
Coordinates39.29174, -89.99956

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length103.3 ft (31.5 m)
Max Span101.0 ft (30.8 m)
Deck Width35.4 ft (10.8 m)
Deck Area340.2 sq m
Main Spans1
Year Built1929 (reconstructed 1985)

Traffic

Avg Daily Traffic1,350 (2023)
Truck Traffic11%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number059002100000000

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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