US Bridges

LA0580 over Tensas Bayou

PoorPosted for load

East Carroll Parish, Louisiana · 2.0 MI East of LA 877 · Structure no. 051808180105571

Built
1958
67 years old
Condition
Poor
inspected March 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
133 ft
7 main spans
Daily traffic
268
2021 count
Owner
State
State Highway Agency

About this bridge

LA0580 over Tensas Bayou is a wood or timber stringer/multi-beam or girder carrying LA0580 over Tensas Bayou in East Carroll Parish, Louisiana. It was built in 1958, so it is 67 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 268 vehicles a day, roughly 19% of them trucks, projected to reach 294 by 2041. The structure is 133 ft (40.5 m) long and 26 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

CarriesLA0580
CrossesTensas Bayou
Location2.0 MI East of LA 877
RouteState Highway 580
Coordinates32.6117, -91.2974
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating11.4 US tons
Inventory rating5 US tons

Structure

MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans7
Design loadH 15
Structure length133 ft (40.5 m)
Longest span19 ft (5.8 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic268 (2021)
Projected traffic294 by 2041
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$634,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0580 over Tensas Bayou built?

It was built in 1958, making it 67 years old in 2025.

What condition is LA0580 over Tensas Bayou in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.

How much traffic does LA0580 over Tensas Bayou carry?

About 268 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is LA0580 over Tensas Bayou?

The structure is 133 ft (40.5 m) long with a longest span of 19 ft (5.8 m) and a deck 26 ft wide.

Who owns LA0580 over Tensas Bayou?

It is owned by the State Highway Agency.