US Bridges

LA0577 over I-20

Fair

Madison Parish, Louisiana · LA 577 over I-20 · Structure no. 053301640214411

Built
1971
54 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
283 ft
6 main spans
Daily traffic
184
2021 count
Owner
State
State Highway Agency

About this bridge

LA0577 over I-20 is a prestressed concrete stringer/multi-beam or girder carrying LA0577 over I-20 in Madison Parish, Louisiana. It was built in 1971, so it is 54 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 184 vehicles a day, roughly 15% of them trucks, projected to reach 202 by 2041. The structure is 283 ft (86.3 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesLA0577
CrossesI-20
LocationLA 577 over I-20
RouteState Highway 577
CountyMadison Parish
StateLouisiana
Coordinates32.43105, -91.4192
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.9 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length283 ft (86.3 m)
Longest span93 ft (28.3 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic184 (2021)
Projected traffic202 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was LA0577 over I-20 built?

It was built in 1971, making it 54 years old in 2025.

What condition is LA0577 over I-20 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 March 2023.

How much traffic does LA0577 over I-20 carry?

About 184 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is LA0577 over I-20?

The structure is 283 ft (86.3 m) long with a longest span of 93 ft (28.3 m) and a deck 43 ft wide.

Who owns LA0577 over I-20?

It is owned by the State Highway Agency.