US Bridges

LA0070-S over Bayou Lafourche

Fair

Assumption Parish, Louisiana · 0.04 M N of LA 1&LA 70-S · Structure no. 610408044001521

Built
1977
48 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
202 ft
4 main spans
Daily traffic
8,101
2021 count
Owner
State
State Highway Agency

About this bridge

LA0070-S over Bayou Lafourche is a prestressed concrete stringer/multi-beam or girder carrying LA0070-S over Bayou Lafourche in Assumption Parish, Louisiana. It was built in 1977, so it is 48 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 8,101 vehicles a day, roughly 7% of them trucks, projected to reach 8,911 by 2041. The structure is 202 ft (61.6 m) long and 47 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesLA0070-S
CrossesBayou Lafourche
Location0.04 M N of LA 1&LA 70-S
RouteState Highway 70
CountyAssumption Parish
StateLouisiana
Coordinates29.98973, -91.02932
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length202 ft (61.6 m)
Longest span50 ft (15.2 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,101 (2021)
Projected traffic8,911 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 LA0070-S over Bayou Lafourche built?

It was built in 1977, making it 48 years old in 2025.

What condition is LA0070-S 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 April 2023.

How much traffic does LA0070-S over Bayou Lafourche carry?

About 8,101 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is LA0070-S over Bayou Lafourche?

The structure is 202 ft (61.6 m) long with a longest span of 50 ft (15.2 m) and a deck 47 ft wide.

Who owns LA0070-S over Bayou Lafourche?

It is owned by the State Highway Agency.