US Bridges

LA0099 over Bayou Alligator

Fair

Jefferson Davis Parish, Louisiana · 2.9 MI S of US 190 · Structure no. 072708272006221

Built
1962
63 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete
Length
80 ft
4 main spans
Daily traffic
1,405
2021 count
Owner
State
State Highway Agency

About this bridge

LA0099 over Bayou Alligator is a concrete slab carrying LA0099 over Bayou Alligator in Jefferson Davis 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 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 1,405 vehicles a day, roughly 17% of them trucks, projected to reach 1,545 by 2041. The structure is 80 ft (24.4 m) long and 29 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesLA0099
CrossesBayou Alligator
Location2.9 MI S of US 190
RouteState Highway 99
CountyJefferson Davis Parish
StateLouisiana
Coordinates30.44034, -92.7756
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 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 rating43 US tons
Inventory rating26 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span20 ft (6.1 m)
Deck width29 ft (8.9 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,405 (2021)
Projected traffic1,545 by 2041
Trucks17%
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 LA0099 over Bayou Alligator built?

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

What condition is LA0099 over Bayou Alligator 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 2023.

How much traffic does LA0099 over Bayou Alligator carry?

About 1,405 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is LA0099 over Bayou Alligator?

The structure is 80 ft (24.4 m) long with a longest span of 20 ft (6.1 m) and a deck 29 ft wide.

Who owns LA0099 over Bayou Alligator?

It is owned by the State Highway Agency.