Structure 53011600000000 · Livingston County, IL

Ill 116 over I-55

Carries Ill 116 over I-55, 1 Mi W Of Pontiac.

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
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT251 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

251 ft end to end, longest span 99 ft: about 3 semi-trucks nose to tail. 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.

Built197452 years old
Length251.0 ft76.5 m
Daily traffic11,000counted 2023
Last inspectedJune 2024every 24 months

Location

StateIllinois
CountyLivingston
Location1 Mi W Of Pontiac
CarriesIll 116
CrossesI-55
Coordinates40.87339, -88.67117

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length251.0 ft (76.5 m)
Max Span99.1 ft (30.2 m)
Deck Width91.9 ft (28 m)
Deck Area2,142 sq m
Main Spans2
Year Built1974

Traffic

Avg Daily Traffic11,000 (2023)
Truck Traffic8%
Lanes On Bridge4
Lanes Under Bridge4

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number053011600000000

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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