US Bridges

LA0353 over Cypress Island Bayou

Fair

St. Martin Parish, Louisiana · 1.9 MI North of LA 31 · Structure no. 035004030304041

Built
1962
63 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete
Length
100 ft
5 main spans
Daily traffic
4,152
2021 count
Owner
State
State Highway Agency

About this bridge

LA0353 over Cypress Island Bayou is a concrete slab carrying LA0353 over Cypress Island Bayou in St. Martin Parish, Louisiana. It was built in 1962, so it is 63 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 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 4,152 vehicles a day, roughly 13% of them trucks, projected to reach 4,567 by 2041. The structure is 100 ft (30.5 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesLA0353
CrossesCypress Island Bayou
Location1.9 MI North of LA 31
RouteState Highway 353
CountySt. Martin Parish
StateLouisiana
Coordinates30.15324, -91.855
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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,152 (2021)
Projected traffic4,567 by 2041
Trucks13%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$498,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0353 over Cypress Island Bayou built?

It was built in 1962, making it 63 years old in 2025.

What condition is LA0353 over Cypress Island 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 August 2024.

How much traffic does LA0353 over Cypress Island Bayou carry?

About 4,152 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA0353 over Cypress Island Bayou?

The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns LA0353 over Cypress Island Bayou?

It is owned by the State Highway Agency.