US Bridges

I0020 over Bayou Lafourche

Fair

Richland Parish, Louisiana · 4.0 MI West of LA 133 · Structure no. 054204510700271

Built
1968
57 years old, rebuilt 1991
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
542 ft
9 main spans
Daily traffic
38,890
2021 count
Owner
State
State Highway Agency

About this bridge

I0020 over Bayou Lafourche is a prestressed concrete stringer/multi-beam or girder carrying I0020 over Bayou Lafourche in Richland Parish, Louisiana. It was built in 1968 and reconstructed in 1991, so it is 57 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 6 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 38,890 vehicles a day, roughly 37% of them trucks, projected to reach 42,779 by 2041. The structure is 542 ft (165.2 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI0020
CrossesBayou Lafourche
Location4.0 MI West of LA 133
RouteInterstate 20
CountyRichland Parish
StateLouisiana
Coordinates32.48388, -91.9317
Functional classRural Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length542 ft (165.2 m)
Longest span60 ft (18.3 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,890 (2021)
Projected traffic42,779 by 2041
Trucks37%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I0020 over Bayou Lafourche built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1991.

What condition is I0020 over Bayou Lafourche 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 October 2023.

How much traffic does I0020 over Bayou Lafourche carry?

About 38,890 vehicles per day (2021 count), of which roughly 37% are trucks.

How long is I0020 over Bayou Lafourche?

The structure is 542 ft (165.2 m) long with a longest span of 60 ft (18.3 m) and a deck 43 ft wide.

Who owns I0020 over Bayou Lafourche?

It is owned by the State Highway Agency.