Structure 14007200000000 · Clinton County, IL

Il 177 over Queens Lake Branch

Carries Il 177 over Queens Lake Branch, 0.2m E New Memphis.

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 FT123 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 8/9

123 ft end to end, longest span 45 ft. 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 slab bridge.

Built199729 years old
Length122.7 ft37.4 m
Daily traffic2,000counted 2023
Last inspectedJuly 2024every 48 months

Location

StateIllinois
CountyClinton
Location0.2m E New Memphis
CarriesIl 177
CrossesQueens Lake Branch
Coordinates38.47058, -89.67728

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length122.7 ft (37.4 m)
Max Span44.9 ft (13.7 m)
Deck Width35.1 ft (10.7 m)
Deck Area400.2 sq m
Main Spans3
Year Built1997

Traffic

Avg Daily Traffic2,000 (2023)
Truck Traffic12%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number014007200000000

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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