Structure 57510700000000 · McLean County, IL

Tr 83 over Br Mackinaw River

Carries Tr 83 over Br Mackinaw River, 2.0 M Sse Clarksvill.

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
CAR · 15 FT55 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

55 ft end to end, longest span 20 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 slab bridge.

Built196561 years old
Length55.1 ft16.8 m
Daily traffic125counted 2024
Last inspectedJanuary 2024every 24 months

Location

StateIllinois
CountyMcLean
Location2.0 M Sse Clarksvill
CarriesTr 83
CrossesBr Mackinaw River
Coordinates40.62248, -88.83758

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length55.1 ft (16.8 m)
Max Span20.0 ft (6.1 m)
Deck Width25.9 ft (7.9 m)
Deck Area132.7 sq m
Main Spans3
Year Built1965

Traffic

Avg Daily Traffic125 (2024)
Truck Traffic58%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 24 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number057510700000000

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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