US Bridges

LA0434 over Bayou Lacombe

FairPosted for load

St. Tammany Parish, Louisiana · 2.5 Miles South of LA 36 · Structure no. 625208521205991

Built
1953
72 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
97 ft
5 main spans
Daily traffic
3,690
2021 count
Owner
State
State Highway Agency

About this bridge

LA0434 over Bayou Lacombe is a wood or timber stringer/multi-beam or girder carrying LA0434 over Bayou Lacombe in St. Tammany Parish, Louisiana. It was built in 1953, so it is 72 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. Its operating status is: posted for load restriction.

It carries about 3,690 vehicles a day, roughly 12% of them trucks, projected to reach 4,059 by 2041. The structure is 97 ft (29.6 m) long and 27 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesLA0434
CrossesBayou Lacombe
Location2.5 Miles South of LA 36
RouteState Highway 434
CountySt. Tammany Parish
StateLouisiana
Coordinates30.39326, -89.895
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating15 US tons
Inventory rating7.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans5
Design loadH 15
Structure length97 ft (29.6 m)
Longest span19 ft (5.8 m)
Deck width27 ft (8.2 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,690 (2021)
Projected traffic4,059 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$483,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0434 over Bayou Lacombe built?

It was built in 1953, making it 72 years old in 2025.

What condition is LA0434 over Bayou Lacombe 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 LA0434 over Bayou Lacombe carry?

About 3,690 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is LA0434 over Bayou Lacombe?

The structure is 97 ft (29.6 m) long with a longest span of 19 ft (5.8 m) and a deck 27 ft wide.

Who owns LA0434 over Bayou Lacombe?

It is owned by the State Highway Agency.