US Bridges

US0090 over B.Caroline & B.Alligator

Fair

Assumption Parish, Louisiana · .84 MI W of LA 662 · Structure no. 610404240601002

Built
1998
27 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
12,074 ft
170 main spans
Daily traffic
10,035
2021 count
Owner
State
State Highway Agency

About this bridge

US0090 over B.Caroline & B.Alligator is a prestressed concrete stringer/multi-beam or girder carrying US0090 over B.Caroline & B.Alligator in Assumption Parish, Louisiana. It was built in 1998, so it is 27 years old, younger 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 10,035 vehicles a day, roughly 14% of them trucks, projected to reach 11,038 by 2041. The structure is 12,074 ft (3,680.2 m) long and 42 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS0090
CrossesB.Caroline & B.Alligator
Location.84 MI W of LA 662
RouteU.S. Route 90
CountyAssumption Parish
StateLouisiana
Coordinates29.66809, -91.05314
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans170 (+16 approach)
Design loadHS 20
Structure length12,074 ft (3,680.2 m)
Longest span70 ft (21.3 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deck17 ft (5.1 m)

Traffic and service

Average daily traffic10,035 (2021)
Projected traffic11,038 by 2041
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes

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$47.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US0090 over B.Caroline & B.Alligator built?

It was built in 1998, making it 27 years old in 2025.

What condition is US0090 over B.Caroline & B.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 September 2024.

How much traffic does US0090 over B.Caroline & B.Alligator carry?

About 10,035 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is US0090 over B.Caroline & B.Alligator?

The structure is 12,074 ft (3,680.2 m) long with a longest span of 70 ft (21.3 m) and a deck 42 ft wide.

Who owns US0090 over B.Caroline & B.Alligator?

It is owned by the State Highway Agency.