US Bridges

Southdown Mandalay over Coulee Canal

GoodPosted for load

Terrebonne Parish, Louisiana · 5 Miles West of LA 316 · Structure no. 025529339904771

Built
2007
18 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete
Length
83 ft
4 main spans
Daily traffic
1,392
2023 count
Owner
County
County Highway Agency

About this bridge

Southdown Mandalay over Coulee Canal is a concrete slab carrying Southdown Mandalay over Coulee Canal in Terrebonne Parish, Louisiana. It was built in 2007, so it is 18 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. Its operating status is: posted for load restriction.

It carries about 1,392 vehicles a day, projected to reach 1,531 by 2043. The structure is 83 ft (25.3 m) long and 41 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSouthdown Mandalay
CrossesCoulee Canal
Location5 Miles West of LA 316
RouteCounty Highway 0
CountyTerrebonne Parish
StateLouisiana
Coordinates29.56363, -90.79497
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating53.2 US tons
Inventory rating41.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length83 ft (25.3 m)
Longest span20 ft (6.1 m)
Deck width41 ft (12.5 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,392 (2023)
Projected traffic1,531 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Southdown Mandalay over Coulee Canal built?

It was built in 2007, making it 18 years old in 2025.

What condition is Southdown Mandalay over Coulee Canal 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 April 2023.

How much traffic does Southdown Mandalay over Coulee Canal carry?

About 1,392 vehicles per day (2023 count).

How long is Southdown Mandalay over Coulee Canal?

The structure is 83 ft (25.3 m) long with a longest span of 20 ft (6.1 m) and a deck 41 ft wide.

Who owns Southdown Mandalay over Coulee Canal?

It is owned by the County Highway Agency.