US Bridges

31st ST over Duncan Canal

Fair

Jefferson Parish, Louisiana · 1.2 Mi. E. of Loyola · Structure no. 022630007901471

Built
2004
21 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete
Length
59 ft
3 main spans
Daily traffic
—
2016 count
Owner
City
City or Municipal Highway Agency

About this bridge

31st ST over Duncan Canal is a concrete slab carrying 31st ST over Duncan Canal in Jefferson Parish, Louisiana. It was built in 2004, so it is 21 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.

No traffic count is recorded. The structure is 59 ft (18 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries31st ST
CrossesDuncan Canal
Location1.2 Mi. E. of Loyola
RouteCounty Highway 0
CountyJefferson Parish
StateLouisiana
Coordinates30.01186, -90.24603
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating51.8 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length59 ft (18 m)
Longest span21 ft (6.4 m)
Deck width28 ft (8.6 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic—
Projected traffic—
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 31st ST over Duncan Canal built?

It was built in 2004, making it 21 years old in 2025.

What condition is 31st ST over Duncan 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 May 2023.

How much traffic does 31st ST over Duncan Canal carry?

No traffic count is recorded for this structure.

How long is 31st ST over Duncan Canal?

The structure is 59 ft (18 m) long with a longest span of 21 ft (6.4 m) and a deck 28 ft wide.

Who owns 31st ST over Duncan Canal?

It is owned by the City or Municipal Highway Agency.