US Bridges

LA0021 over Bayou Dezeire

Fair

St. Tammany Parish, Louisiana · 0.3 M S of LA 1077 · Structure no. 625200590100771

Built
1978
47 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
100 ft
5 main spans
Daily traffic
6,406
2021 count
Owner
State
State Highway Agency

About this bridge

LA0021 over Bayou Dezeire is a concrete slab carrying LA0021 over Bayou Dezeire in St. Tammany Parish, Louisiana. It was built in 1978, so it is 47 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 6,406 vehicles a day, roughly 8% of them trucks, projected to reach 7,046 by 2041. The structure is 100 ft (30.5 m) long and 46 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesLA0021
CrossesBayou Dezeire
Location0.3 M S of LA 1077
RouteState Highway 21
CountySt. Tammany Parish
StateLouisiana
Coordinates30.413, -90.1612
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating44 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 width46 ft (14.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,406 (2021)
Projected traffic7,046 by 2041
Trucks8%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0021 over Bayou Dezeire built?

It was built in 1978, making it 47 years old in 2025.

What condition is LA0021 over Bayou Dezeire 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 September 2023.

How much traffic does LA0021 over Bayou Dezeire carry?

About 6,406 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is LA0021 over Bayou Dezeire?

The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.1 m) and a deck 46 ft wide.

Who owns LA0021 over Bayou Dezeire?

It is owned by the State Highway Agency.