US Bridges

LA0308 over Drainage Canal

PoorPosted for load

Lafourche Parish, Louisiana · .5 MI South of LA 655 · Structure no. 022904079014381

Built
1965
60 years old
Condition
Poor
inspected August 2023
Type
Slab
Concrete
Length
114 ft
6 main spans
Daily traffic
11,623
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 1965, so it is 60 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 11,623 vehicles a day, roughly 11% of them trucks, projected to reach 12,785 by 2041. The structure is 114 ft (34.7 m) long and 29 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesLA0308
CrossesDrainage Canal
Location.5 MI South of LA 655
RouteState Highway 308
CountyLafourche Parish
StateLouisiana
Coordinates29.64294, -90.51994
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating25.7 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans6
Design loadH 15
Structure length114 ft (34.7 m)
Longest span19 ft (5.8 m)
Deck width29 ft (8.7 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,623 (2021)
Projected traffic12,785 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$556,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0308 over Drainage Canal built?

It was built in 1965, making it 60 years old in 2025.

What condition is LA0308 over Drainage Canal in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does LA0308 over Drainage Canal carry?

About 11,623 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0308 over Drainage Canal?

The structure is 114 ft (34.7 m) long with a longest span of 19 ft (5.8 m) and a deck 29 ft wide.

Who owns LA0308 over Drainage Canal?

It is owned by the State Highway Agency.