US Bridges

LA0033 over Bayou Darbonne

Fair

Union Parish, Louisiana · 1.2 MI North of LA 15 · Structure no. 055600690207121

Built
1963
62 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
962 ft
16 main spans
Daily traffic
10,540
2021 count
Owner
State
State Highway Agency

About this bridge

LA0033 over Bayou Darbonne is a prestressed concrete stringer/multi-beam or girder carrying LA0033 over Bayou Darbonne in Union Parish, Louisiana. It was built in 1963, so it is 62 years old, older 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 5 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 10,540 vehicles a day, roughly 16% of them trucks, projected to reach 11,594 by 2041. The structure is 962 ft (293.2 m) long and 33 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

Open in Google Maps
CarriesLA0033
CrossesBayou Darbonne
Location1.2 MI North of LA 15
RouteState Highway 33
CountyUnion Parish
StateLouisiana
Coordinates32.75572, -92.4162
Functional classRural Minor Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating89.9 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans16
Design loadHS 20
Structure length962 ft (293.2 m)
Longest span60 ft (18.3 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,540 (2021)
Projected traffic11,594 by 2041
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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 LA0033 over Bayou Darbonne built?

It was built in 1963, making it 62 years old in 2025.

What condition is LA0033 over Bayou Darbonne 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 May 2024.

How much traffic does LA0033 over Bayou Darbonne carry?

About 10,540 vehicles per day (2021 count), of which roughly 16% are trucks.

How long is LA0033 over Bayou Darbonne?

The structure is 962 ft (293.2 m) long with a longest span of 60 ft (18.3 m) and a deck 33 ft wide.

Who owns LA0033 over Bayou Darbonne?

It is owned by the State Highway Agency.