US Bridges

LA0577 over Big Colewa Bayou

Fair

West Carroll Parish, Louisiana · .7 MI East of LA 585 · Structure no. 056201850304391

Built
1953
72 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
242 ft
6 main spans
Daily traffic
365
2021 count
Owner
State
State Highway Agency

About this bridge

LA0577 over Big Colewa Bayou is a steel stringer/multi-beam or girder carrying LA0577 over Big Colewa Bayou in West Carroll Parish, Louisiana. It was built in 1953, so it is 72 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 365 vehicles a day, roughly 19% of them trucks, projected to reach 401 by 2041. The structure is 242 ft (73.8 m) long and 29 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesLA0577
CrossesBig Colewa Bayou
Location.7 MI East of LA 585
RouteState Highway 577
CountyWest Carroll Parish
StateLouisiana
Coordinates32.6818, -91.5585
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length242 ft (73.8 m)
Longest span40 ft (12.2 m)
Deck width29 ft (8.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic365 (2021)
Projected traffic401 by 2041
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 LA0577 over Big Colewa Bayou built?

It was built in 1953, making it 72 years old in 2025.

What condition is LA0577 over Big Colewa 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 January 2023.

How much traffic does LA0577 over Big Colewa Bayou carry?

About 365 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is LA0577 over Big Colewa Bayou?

The structure is 242 ft (73.8 m) long with a longest span of 40 ft (12.2 m) and a deck 29 ft wide.

Who owns LA0577 over Big Colewa Bayou?

It is owned by the State Highway Agency.