Structure 84300250300701 · Sabine County, LA

Us0171 over Harpoon Bayou Relief

Carries Us0171 over Harpoon Bayou Relief, 0.28 Mi. South Of La 175.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT199 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

199 ft end to end, longest span 20 ft: about 3 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 slab bridge.

Built198541 years old
Length199.1 ft60.7 m
Daily traffic10,204counted 2021
Last inspectedOctober 2024every 24 months

Location

StateLouisiana
CountySabine
Location0.28 Mi. South Of La 175
CarriesUs0171
CrossesHarpoon Bayou Relief
Coordinates31.57521, -93.49470

Physical Characteristics

MaterialConcrete
DesignSlab
Total Length199.1 ft (60.7 m)
Max Span20.0 ft (6.1 m)
Deck Width42.7 ft (13 m)
Deck Area789.1 sq m
Main Spans10
Year Built1985

Traffic

Avg Daily Traffic10,204 (2021)
Truck Traffic15%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical4 — Foundations need monitoring
Structure Number084300250300701

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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