US Bridges

LA0001 over Marsh

Good

Lafourche Parish, Louisiana · LA 1 1.5 Miles North of B · Structure no. 022900000020417

Built
2009
16 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
3,233 ft
33 main spans
Daily traffic
3,305
2021 count
Owner
State
State Highway Agency

About this bridge

LA0001 over Marsh is a prestressed concrete stringer/multi-beam or girder carrying LA0001 over Marsh in Lafourche Parish, Louisiana. It was built in 2009, so it is 16 years old, younger than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,305 vehicles a day, roughly 20% of them trucks, projected to reach 3,635 by 2041. The structure is 3,233 ft (985.4 m) long and 43 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesLA0001
CrossesMarsh
LocationLA 1 1.5 Miles North of B
RouteState Highway 1
CountyLafourche Parish
StateLouisiana
Coordinates29.25296, -90.2235
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating47.5 US tons
Inventory rating22.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans33 (+46 approach)
Design loadHS 20
Structure length3,233 ft (985.4 m)
Longest span68 ft (20.7 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,305 (2021)
Projected traffic3,635 by 2041
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollToll bridge
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0001 over Marsh built?

It was built in 2009, making it 16 years old in 2025.

What condition is LA0001 over Marsh in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does LA0001 over Marsh carry?

About 3,305 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is LA0001 over Marsh?

The structure is 3,233 ft (985.4 m) long with a longest span of 68 ft (20.7 m) and a deck 43 ft wide.

Who owns LA0001 over Marsh?

It is owned by the State Highway Agency.