Structure 14308100000000 · Clinton County, IL

Tr 175 over Prairie Branch

Carries Tr 175 over Prairie Branch, 2 Mi NE Hoffmann.

Overall conditionPoor

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

How ratings work
Deck7/9 · Good
Superstructure6/9 · Satisfactory
Substructuresets the rating4/9 · Poor
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT30 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9Substructure 4/9 · sets the rating

30 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 multi-beam bridge.

Built194086 years old
Length29.9 ft9.1 m
Daily traffic300counted 2020
Last inspectedJanuary 2025every 24 months

Location

StateIllinois
CountyClinton
Location2 Mi NE Hoffmann
CarriesTr 175
CrossesPrairie Branch
Coordinates38.56521, -89.22009

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length29.9 ft (9.1 m)
Max Span27.9 ft (8.5 m)
Deck Width20.3 ft (6.2 m)
Deck Area56.4 sq m
Main Spans1
Year Built1940

Traffic

Avg Daily Traffic300 (2020)
Truck Traffic6%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2025
Inspection FrequencyEvery 24 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number014308100000000

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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