Structure 616300000616314 · West Feliciana County, LA

La 421 over Mid Fk Thom CR Tr

Carries La 421 over Mid Fk Thom CR Tr, 1.1 M E Of La 967.

Overall conditionGood

Set by its lowest-rated component: Substructure at 7 of 9.

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT120 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 7/9 · sets the rating

120 ft end to end, longest span 20 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.

Built20233 years old
Length120.1 ft36.6 m
Daily traffic343counted 2023
Last inspectedJune 2023every 24 months

Location

StateLouisiana
CountyWest Feliciana
Location1.1 M E Of La 967
CarriesLa 421
CrossesMid Fk Thom CR Tr
Coordinates30.94084, -91.24657

Physical Characteristics

MaterialConcrete
DesignSlab
Total Length120.1 ft (36.6 m)
Max Span20.0 ft (6.1 m)
Deck Width34.4 ft (10.5 m)
Deck Area384.3 sq m
Main Spans6
Year Built2023

Traffic

Avg Daily Traffic343 (2023)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number616300000616314

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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