US Bridges

LA0308 over LA657-ICWW-STR@LAROSE

Good

Lafourche Parish, Louisiana · .5 MI North of LA 1 · Structure no. 022904079003501

Built
1975
50 years old
Condition
Good
inspected November 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
3,590 ft
3 main spans
Daily traffic
12,186
2021 count
Owner
State
State Highway Agency

About this bridge

LA0308 over LA657-ICWW-STR@LAROSE is a steel continuous girder and floorbeam system carrying LA0308 over LA657-ICWW-STR@LAROSE in Lafourche Parish, Louisiana. It was built in 1975, so it is 50 years old, older 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 12,186 vehicles a day, roughly 11% of them trucks, projected to reach 13,404 by 2041. The structure is 3,590 ft (1,094.2 m) long and 38 ft wide.

Location

Open in Google Maps
CarriesLA0308
CrossesLA657-ICWW-STR@LAROSE
Location.5 MI North of LA 1
RouteState Highway 308
CountyLafourche Parish
StateLouisiana
Coordinates29.57486, -90.37557
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
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 evaluation7: Better than 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 alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+33 approach)
Design loadHS 20
Structure length3,590 ft (1,094.2 m)
Longest span300 ft (91.4 m)
Deck width38 ft (11.5 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,186 (2021)
Projected traffic13,404 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was LA0308 over LA657-ICWW-STR@LAROSE built?

It was built in 1975, making it 50 years old in 2025.

What condition is LA0308 over LA657-ICWW-STR@LAROSE 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 LA0308 over LA657-ICWW-STR@LAROSE carry?

About 12,186 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0308 over LA657-ICWW-STR@LAROSE?

The structure is 3,590 ft (1,094.2 m) long with a longest span of 300 ft (91.4 m) and a deck 38 ft wide.

Who owns LA0308 over LA657-ICWW-STR@LAROSE?

It is owned by the State Highway Agency.