US Bridges

LA0584 over Cow Bayou

Fair

Richland Parish, Louisiana · 4.0 MI East of US 425 · Structure no. 054203400104021

Built
1954
71 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
173 ft
9 main spans
Daily traffic
990
2021 count
Owner
State
State Highway Agency

About this bridge

LA0584 over Cow Bayou is a wood or timber stringer/multi-beam or girder carrying LA0584 over Cow Bayou in Richland Parish, Louisiana. It was built in 1954, so it is 71 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 990 vehicles a day, roughly 19% of them trucks, projected to reach 1,089 by 2041. The structure is 173 ft (52.7 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLA0584
CrossesCow Bayou
Location4.0 MI East of US 425
RouteState Highway 584
CountyRichland Parish
StateLouisiana
Coordinates32.40574, -91.699
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans9
Design loadH 15
Structure length173 ft (52.7 m)
Longest span19 ft (5.8 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic990 (2021)
Projected traffic1,089 by 2041
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0584 over Cow Bayou built?

It was built in 1954, making it 71 years old in 2025.

What condition is LA0584 over Cow Bayou in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does LA0584 over Cow Bayou carry?

About 990 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is LA0584 over Cow Bayou?

The structure is 173 ft (52.7 m) long with a longest span of 19 ft (5.8 m) and a deck 26 ft wide.

Who owns LA0584 over Cow Bayou?

It is owned by the State Highway Agency.