Structure 9356200000000 · Cass County, IL

Tr 152 over Conover Ck

Carries Tr 152 over Conover Ck, 0.65 Mi S Tr 151.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructure8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT67 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 7/9 · sets the ratingSubstructure 8/9

67 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 box-beam bridge.

Built20215 years old
Length66.9 ft20.4 m
Daily traffic25counted 2023
Last inspectedJanuary 2023every 48 months

Location

StateIllinois
CountyCass
Location0.65 Mi S Tr 151
CarriesTr 152
CrossesConover Ck
Coordinates39.87793, -90.10262

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length66.9 ft (20.4 m)
Max Span64.0 ft (19.5 m)
Deck Width29.9 ft (9.1 m)
Deck Area185.6 sq m
Main Spans1
Year Built2021

Traffic

Avg Daily Traffic25 (2023)
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2023
Inspection FrequencyEvery 48 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number009356200000000

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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