US Bridges

LA0023 over Doullut Canal

Fair

Plaquemines Parish, Louisiana · 46.9 MI South of LA 406 · Structure no. 023800620508961

Built
1975
50 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
4,055 ft
5 main spans
Daily traffic
5,170
2021 count
Owner
State
State Highway Agency

About this bridge

LA0023 over Doullut Canal is a steel stringer/multi-beam or girder carrying LA0023 over Doullut Canal in Plaquemines 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 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 5,170 vehicles a day, roughly 20% of them trucks, projected to reach 5,687 by 2041. The structure is 4,055 ft (1,236 m) long and 68 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLA0023
CrossesDoullut Canal
Location46.9 MI South of LA 406
RouteState Highway 23
CountyPlaquemines Parish
StateLouisiana
Coordinates29.38887, -89.60502
Functional classRural 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5 (+38 approach)
Design loadHS 20
Structure length4,055 ft (1,236 m)
Longest span300 ft (91.4 m)
Deck width68 ft (20.6 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,170 (2021)
Projected traffic5,687 by 2041
Trucks20%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was LA0023 over Doullut Canal built?

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

What condition is LA0023 over Doullut 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 September 2024.

How much traffic does LA0023 over Doullut Canal carry?

About 5,170 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is LA0023 over Doullut Canal?

The structure is 4,055 ft (1,236 m) long with a longest span of 300 ft (91.4 m) and a deck 68 ft wide.

Who owns LA0023 over Doullut Canal?

It is owned by the State Highway Agency.