US Bridges

LA0577 over Diversion Channel

Fair

Madison Parish, Louisiana · .1 MI North of LA 610 · Structure no. 053303440302041

Built
1962
63 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
362 ft
8 main spans
Daily traffic
914
2021 count
Owner
State
State Highway Agency

About this bridge

LA0577 over Diversion Channel is a steel stringer/multi-beam or girder carrying LA0577 over Diversion Channel in Madison Parish, Louisiana. It was built in 1962, so it is 63 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 914 vehicles a day, roughly 19% of them trucks, projected to reach 1,005 by 2041. The structure is 362 ft (110.3 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesLA0577
CrossesDiversion Channel
Location.1 MI North of LA 610
RouteState Highway 577
CountyMadison Parish
StateLouisiana
Coordinates32.2518, -91.5233
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating35.4 US tons
Inventory rating27.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans8
Design loadH 15
Structure length362 ft (110.3 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic914 (2021)
Projected traffic1,005 by 2041
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Diversion Channel built?

It was built in 1962, making it 63 years old in 2025.

What condition is LA0577 over Diversion Channel 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 April 2023.

How much traffic does LA0577 over Diversion Channel carry?

About 914 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is LA0577 over Diversion Channel?

The structure is 362 ft (110.3 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns LA0577 over Diversion Channel?

It is owned by the State Highway Agency.