Structure 70208021100121 · Allen County, LA

La1156 over Mill Creek

Carries La1156 over Mill Creek, 0.9 Mi E Of La 112.

Overall conditionPoor

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

How ratings work
Decksets the rating4/9 · Poor
Superstructuresets the rating4/9 · Poor
Substructuresets the rating4/9 · Poor
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT78 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9Superstructure 4/9Substructure 4/9

78 ft end to end, longest span 19 ft. 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 slab bridge.

Built196660 years old
Length78.1 ft23.8 m
Daily traffic550counted 2021
Last inspectedJanuary 2024every 24 months

Location

StateLouisiana
CountyAllen
Location0.9 Mi E Of La 112
CarriesLa1156
CrossesMill Creek
Coordinates30.86919, -92.79493

Physical Characteristics

MaterialConcrete
DesignSlab
Total Length78.1 ft (23.8 m)
Max Span19.0 ft (5.8 m)
Deck Width31.5 ft (9.6 m)
Deck Area228.5 sq m
Main Spans4
Year Built1966

Traffic

Avg Daily Traffic550 (2021)
Truck Traffic17%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number070208021100121

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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