Structure 14008000000000 · Clinton County, IL

Ill 161 over Crooked Creek

Carries Ill 161 over Crooked Creek, 8.6 M E Il 127.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 8 of 9.

How ratings work
Decksets the rating8/9 · Very Good
Superstructuresets the rating8/9 · Very Good
Substructuresets the rating8/9 · Very Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,074 FT OVERALL200 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 8/9

1,074 ft end to end, longest span 192 ft: about 3.0 football fields. 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.

Built20197 years old
Length1074.5 ft327.5 m
Daily traffic6,100counted 2023
Last inspectedApril 2023every 24 months

Location

StateIllinois
CountyClinton
Location8.6 M E Il 127
CarriesIll 161
CrossesCrooked Creek
Coordinates38.53488, -89.19348

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length1074.5 ft (327.5 m)
Max Span191.9 ft (58.5 m)
Deck Width43.3 ft (13.2 m)
Deck Area4,323 sq m
Main Spans8
Year Built2019

Traffic

Avg Daily Traffic6,100 (2023)
Truck Traffic9%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number014008000000000

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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