US Bridges

Despaux DR over 20 Arpent Canal

Fair

St. Bernard Parish, Louisiana · 0.5 MI N of LA 39 · Structure no. 024400000000007

Built
1994
31 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete
Length
57 ft
3 main spans
Daily traffic
216
2023 count
Owner
County
County Highway Agency

About this bridge

Despaux DR over 20 Arpent Canal is a concrete slab carrying Despaux DR over 20 Arpent Canal in St. Bernard Parish, Louisiana. It was built in 1994, so it is 31 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 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 216 vehicles a day, projected to reach 237 by 2043. The structure is 57 ft (17.4 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesDespaux DR
Crosses20 Arpent Canal
Location0.5 MI N of LA 39
RouteCounty Highway 0
CountySt. Bernard Parish
StateLouisiana
Coordinates29.944, -89.93987
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 rating50.4 US tons
Inventory rating38.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20 + Mod
Structure length57 ft (17.4 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic216 (2023)
Projected traffic237 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Despaux DR over 20 Arpent Canal built?

It was built in 1994, making it 31 years old in 2025.

What condition is Despaux DR over 20 Arpent 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 March 2023.

How much traffic does Despaux DR over 20 Arpent Canal carry?

About 216 vehicles per day (2023 count).

How long is Despaux DR over 20 Arpent Canal?

The structure is 57 ft (17.4 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns Despaux DR over 20 Arpent Canal?

It is owned by the County Highway Agency.