US Bridges

LA0429 over Smith Bayou

Fair

Ascension Parish, Louisiana · 1.6 M W of LA 44 · Structure no. 610300773003031

Built
1969
56 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
100 ft
5 main spans
Daily traffic
9,071
2021 count
Owner
State
State Highway Agency

About this bridge

LA0429 over Smith Bayou is a concrete slab carrying LA0429 over Smith Bayou in Ascension Parish, Louisiana. It was built in 1969, so it is 56 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 9,071 vehicles a day, roughly 11% of them trucks, projected to reach 9,978 by 2041. The structure is 100 ft (30.5 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLA0429
CrossesSmith Bayou
Location1.6 M W of LA 44
RouteState Highway 429
CountyAscension Parish
StateLouisiana
Coordinates30.23266, -90.94712
Functional classUrban 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.8 US tons
Inventory rating20.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans5
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span19 ft (5.8 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,071 (2021)
Projected traffic9,978 by 2041
Trucks11%
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

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$478,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0429 over Smith Bayou built?

It was built in 1969, making it 56 years old in 2025.

What condition is LA0429 over Smith Bayou 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 October 2024.

How much traffic does LA0429 over Smith Bayou carry?

About 9,071 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0429 over Smith Bayou?

The structure is 100 ft (30.5 m) long with a longest span of 19 ft (5.8 m) and a deck 29 ft wide.

Who owns LA0429 over Smith Bayou?

It is owned by the State Highway Agency.