Structure 83500533005011 · Natchitoches County, LA

La0491 over Cane River

Carries La0491 over Cane River, 0.15 Mi. East Of La 1.

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 overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT442 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

442 ft end to end, longest span 55 ft: about 6 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 multi-beam bridge.

Built197056 years old
Length441.9 ft134.7 m
Daily traffic237counted 2021
Last inspectedJune 2023every 24 months

Location

StateLouisiana
CountyNatchitoches
Location0.15 Mi. East Of La 1
CarriesLa0491
CrossesCane River
Coordinates31.53748, -92.91830

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length441.9 ft (134.7 m)
Max Span55.1 ft (16.8 m)
Deck Width29.9 ft (9.1 m)
Deck Area1225.8 sq m
Main Spans8
Year Built1970

Traffic

Avg Daily Traffic237 (2021)
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 CriticalUnknown
Structure Number083500533005011

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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