US Bridges

Dupard St. over Little Bayou Castine

Good

St. Tammany Parish, Louisiana · 0.65 MI E. of LA 59 · Structure no. 625200000625220

Built
1998
27 years old
Condition
Good
inspected December 2023
Type
Culvert
Steel
Length
45 ft
4 main spans
Daily traffic
400
2020 count
Owner
County
County Highway Agency

About this bridge

Dupard St. over Little Bayou Castine is a steel culvert carrying Dupard St. over Little Bayou Castine in St. Tammany Parish, Louisiana. It was built in 1998, so it is 27 years old, younger than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 400 vehicles a day, projected to reach 440 by 2040. The structure is 45 ft (13.7 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesDupard St.
CrossesLittle Bayou Castine
Location0.65 MI E. of LA 59
RouteCounty Highway 0
CountySt. Tammany Parish
StateLouisiana
Coordinates30.36539, -90.0476
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating35.1 US tons
Inventory rating27.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans4
Design loadHL 93
Structure length45 ft (13.7 m)
Longest span8 ft (2.4 m)
Deck width45 ft (13.7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2020)
Projected traffic440 by 2040
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 Dupard St. over Little Bayou Castine built?

It was built in 1998, making it 27 years old in 2025.

What condition is Dupard St. over Little Bayou Castine in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does Dupard St. over Little Bayou Castine carry?

About 400 vehicles per day (2020 count).

How long is Dupard St. over Little Bayou Castine?

The structure is 45 ft (13.7 m) long with a longest span of 8 ft (2.4 m) and a deck 45 ft wide.

Who owns Dupard St. over Little Bayou Castine?

It is owned by the County Highway Agency.