US Bridges

LA0471 over Dartigo Creek

Good

Grant Parish, Louisiana · 5.88 M N of US 71 · Structure no. 082200000080668

Built
2021
4 years old
Condition
Good
inspected July 2024
Type
Slab
Concrete
Length
100 ft
5 main spans
Daily traffic
510
2019 count
Owner
State
State Highway Agency

About this bridge

LA0471 over Dartigo Creek is a concrete slab carrying LA0471 over Dartigo Creek in Grant Parish, Louisiana. It was built in 2021, so it is 4 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 510 vehicles a day, roughly 15% of them trucks, projected to reach 561 by 2039. The structure is 100 ft (30.5 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesLA0471
CrossesDartigo Creek
Location5.88 M N of US 71
RouteState Highway 471
Coordinates31.64846, -92.72861
Functional classRural Minor Collector

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 protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadGreater than HL 93
Structure length100 ft (30.5 m)
Longest span20 ft (6.1 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic510 (2019)
Projected traffic561 by 2039
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 LA0471 over Dartigo Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is LA0471 over Dartigo Creek 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 LA0471 over Dartigo Creek carry?

About 510 vehicles per day (2019 count), of which roughly 15% are trucks.

How long is LA0471 over Dartigo Creek?

The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.1 m) and a deck 32 ft wide.

Who owns LA0471 over Dartigo Creek?

It is owned by the State Highway Agency.