Structure 76000700000000 · Pope County, IL

Ill 146 over Hills Branch

Carries Ill 146 over Hills Branch, 0.3 Mi E Of Ill 145.

Overall conditionFair

Set by its lowest-rated component: Superstructure and Substructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating5/9 · Fair
Substructuresets the rating5/9 · Fair
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT348 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 5/9 · sets the ratingSubstructure 5/9 · sets the rating

348 ft end to end, longest span 188 ft: about 5 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 bridge of this kind.

Built1928rebuilt 1975
Length347.8 ft106 m
Daily traffic1,450counted 2023
Last inspectedNovember 2024every 12 months

Location

StateIllinois
CountyPope
Location0.3 Mi E Of Ill 145
CarriesIll 146
CrossesHills Branch
Coordinates37.38311, -88.67150

Physical Characteristics

MaterialConcrete
DesignOther
Total Length347.8 ft (106 m)
Max Span188.0 ft (57.3 m)
Deck Width34.1 ft (10.4 m)
Deck Area1102.4 sq m
Main Spans3
Year Built1928 (reconstructed 1975)

Traffic

Avg Daily Traffic1,450 (2023)
Truck Traffic12%
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number076000700000000

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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