US Bridges

LA0433 over Bayou Bonfouca

Fair

St. Tammany Parish, Louisiana · LA0433 · Structure no. 625208522106161

Built
1976
49 years old
Condition
Fair
inspected October 2023
Type
Movable - Swing
Steel
Length
325 ft
2 main spans
Daily traffic
9,174
2021 count
Owner
State
State Highway Agency

About this bridge

LA0433 over Bayou Bonfouca is a steel movable - swing carrying LA0433 over Bayou Bonfouca in St. Tammany Parish, Louisiana. It was built in 1976, so it is 49 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 9,174 vehicles a day, roughly 8% of them trucks, projected to reach 10,091 by 2041. The structure is 325 ft (99.1 m) long and 31 ft wide.

Location

Open in Google Maps
CarriesLA0433
CrossesBayou Bonfouca
LocationLA0433
RouteState Highway 433
CountySt. Tammany Parish
StateLouisiana
Coordinates30.27182, -89.794
Functional classUrban 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating31 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+4 approach)
Design loadHS 20
Structure length325 ft (99.1 m)
Longest span245 ft (74.7 m)
Deck width31 ft (9.3 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic9,174 (2021)
Projected traffic10,091 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was LA0433 over Bayou Bonfouca built?

It was built in 1976, making it 49 years old in 2025.

What condition is LA0433 over Bayou Bonfouca 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 2023.

How much traffic does LA0433 over Bayou Bonfouca carry?

About 9,174 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is LA0433 over Bayou Bonfouca?

The structure is 325 ft (99.1 m) long with a longest span of 245 ft (74.7 m) and a deck 31 ft wide.

Who owns LA0433 over Bayou Bonfouca?

It is owned by the State Highway Agency.