Structure 83504550646811 · Natchitoches County, LA

I0049 over Thompson Creek

Carries I0049 over Thompson Creek, 0.16 Mi. North Of La 174.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT140 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

140 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.

Built198541 years old
Length140.1 ft42.7 m
Daily traffic16,334counted 2021
Last inspectedMay 2024every 24 months

Location

StateLouisiana
CountyNatchitoches
Location0.16 Mi. North Of La 174
CarriesI0049
CrossesThompson Creek
Coordinates31.89045, -93.37630

Physical Characteristics

MaterialConcrete
DesignSlab
Total Length140.1 ft (42.7 m)
Max Span20.0 ft (6.1 m)
Deck Width43.0 ft (13.1 m)
Deck Area559.4 sq m
Main Spans7
Year Built1985

Traffic

Avg Daily Traffic16,334 (2021)
Truck Traffic30%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number083504550646811

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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