Structure 6407700000000 · Bureau County, IL

Tr-109 over Lime Creek

Carries Tr-109 over Lime Creek, 4 Mi. W. Green Oak.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 4 of 9.

How ratings work
Deck5/9 · Fair
Superstructure5/9 · Fair
Substructuresets the rating4/9 · Poor
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT49 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 5/9Substructure 4/9 · sets the rating

49 ft end to end, longest span 16 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.

Built195967 years old
Length48.9 ft14.9 m
Daily traffic150counted 2020
Last inspectedNovember 2023every 24 months

Location

StateIllinois
CountyBureau
Location4 Mi. W. Green Oak
CarriesTr-109
CrossesLime Creek
Coordinates41.48028, -89.46987

Physical Characteristics

MaterialConcrete
DesignChannel Beam
Total Length48.9 ft (14.9 m)
Max Span16.1 ft (4.9 m)
Deck Width26.2 ft (8 m)
Deck Area119.2 sq m
Main Spans3
Year Built1959

Traffic

Avg Daily Traffic150 (2020)
Truck Traffic22%
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2023
Inspection FrequencyEvery 24 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number006407700000000

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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