Structure 76584 · White County, IN

US 421 over Little Monon Creek

Carries US 421 over Little Monon Creek, 00.72 S SR 16.

Overall conditionFair

Set by its lowest-rated component: Superstructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
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 FT77 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 8/9

77 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.

Built2009rebuilt 2020
Length77.4 ft23.6 m
Daily traffic6,960counted 2008
Last inspectedMay 2023every 24 months

Location

StateIndiana
CountyWhite
Location00.72 S SR 16
CarriesUS 421
CrossesLittle Monon Creek
Coordinates40.85754, -86.87900

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Single/Spread
Total Length77.4 ft (23.6 m)
Max Span74.5 ft (22.7 m)
Deck Width46.9 ft (14.3 m)
Deck Area337.5 sq m
Main Spans1
Year Built2009 (reconstructed 2020)

Traffic

Avg Daily Traffic6,960 (2008)
Truck Traffic22%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number076584

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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