US Bridges

Nation Road over Coulee Duralde

Good

Acadia Parish, Louisiana · 0.5 MI S of LA 35 · Structure no. 030100000000154

Built
2019
6 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
120 ft
3 main spans
Daily traffic
336
2020 count
Owner
County
County Highway Agency

About this bridge

Nation Road over Coulee Duralde is a prestressed concrete stringer/multi-beam or girder carrying Nation Road over Coulee Duralde in Acadia Parish, Louisiana. It was built in 2019, so it is 6 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 336 vehicles a day, projected to reach 369 by 2040. The structure is 120 ft (36.6 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNation Road
CrossesCoulee Duralde
Location0.5 MI S of LA 35
RouteCounty Highway 0
CountyAcadia Parish
StateLouisiana
Coordinates30.25336, -92.26183
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 alignment6: Equal to present minimum criteria
Operating rating64.3 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length120 ft (36.6 m)
Longest span40 ft (12.2 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic336 (2020)
Projected traffic369 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 Nation Road over Coulee Duralde built?

It was built in 2019, making it 6 years old in 2025.

What condition is Nation Road over Coulee Duralde 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 July 2024.

How much traffic does Nation Road over Coulee Duralde carry?

About 336 vehicles per day (2020 count).

How long is Nation Road over Coulee Duralde?

The structure is 120 ft (36.6 m) long with a longest span of 40 ft (12.2 m) and a deck 31 ft wide.

Who owns Nation Road over Coulee Duralde?

It is owned by the County Highway Agency.