US Bridges

LA0308 over Drainage Canal

Fair

Lafourche Parish, Louisiana · 4.8 MI N of LA 657 · Structure no. 022900000020553

Built
2011
14 years old
Condition
Fair
inspected December 2024
Type
Slab
Concrete
Length
95 ft
5 main spans
Daily traffic
12,186
2021 count
Owner
State
State Highway Agency

About this bridge

LA0308 over Drainage Canal is a concrete slab carrying LA0308 over Drainage Canal in Lafourche Parish, Louisiana. It was built in 2011, so it is 14 years old, younger 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 12,186 vehicles a day, roughly 11% of them trucks, projected to reach 13,404 by 2041. The structure is 95 ft (29 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLA0308
CrossesDrainage Canal
Location4.8 MI N of LA 657
RouteState Highway 308
CountyLafourche Parish
StateLouisiana
Coordinates29.58897, -90.44299
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans5
Design loadHS 20
Structure length95 ft (29 m)
Longest span19 ft (5.8 m)
Deck width35 ft (10.7 m)
Roadway width27 ft (8.2 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
CrossesWaterway
Detour if closed1.9 mi (3 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 LA0308 over Drainage Canal built?

It was built in 2011, making it 14 years old in 2025.

What condition is LA0308 over Drainage Canal 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 December 2024.

How much traffic does LA0308 over Drainage Canal carry?

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

How long is LA0308 over Drainage Canal?

The structure is 95 ft (29 m) long with a longest span of 19 ft (5.8 m) and a deck 35 ft wide.

Who owns LA0308 over Drainage Canal?

It is owned by the State Highway Agency.