US Bridges

LA0001 over Bayou Darbonne Trib

Fair

Natchitoches Parish, Louisiana · .35 Mi. N of Int LA119 · Structure no. 083500530311821

Built
1990
35 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
320 ft
16 main spans
Daily traffic
996
2021 count
Owner
State
State Highway Agency

About this bridge

LA0001 over Bayou Darbonne Trib is a concrete slab carrying LA0001 over Bayou Darbonne Trib in Natchitoches Parish, Louisiana. It was built in 1990, so it is 35 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 996 vehicles a day, roughly 14% of them trucks, projected to reach 1,095 by 2041. The structure is 320 ft (97.5 m) long and 47 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesLA0001
CrossesBayou Darbonne Trib
Location.35 Mi. N of Int LA119
RouteState Highway 1
CountyNatchitoches Parish
StateLouisiana
Coordinates31.53616, -92.9502
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans16
Design loadHS 20
Structure length320 ft (97.5 m)
Longest span20 ft (6.1 m)
Deck width47 ft (14.3 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic996 (2021)
Projected traffic1,095 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 LA0001 over Bayou Darbonne Trib built?

It was built in 1990, making it 35 years old in 2025.

What condition is LA0001 over Bayou Darbonne Trib 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 April 2024.

How much traffic does LA0001 over Bayou Darbonne Trib carry?

About 996 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA0001 over Bayou Darbonne Trib?

The structure is 320 ft (97.5 m) long with a longest span of 20 ft (6.1 m) and a deck 47 ft wide.

Who owns LA0001 over Bayou Darbonne Trib?

It is owned by the State Highway Agency.