US Bridges

US0090 over Little Bayou Black

Fair

St. Mary Parish, Louisiana · 8.3 MI East of LA 182 · Structure no. 035104240531741

Built
1964
61 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete
Length
60 ft
3 main spans
Daily traffic
7,885
2021 count
Owner
State
State Highway Agency

About this bridge

US0090 over Little Bayou Black is a concrete slab carrying US0090 over Little Bayou Black in St. Mary Parish, Louisiana. It was built in 1964, so it is 61 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 7,885 vehicles a day, roughly 10% of them trucks, projected to reach 8,673 by 2041. The structure is 60 ft (18.3 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS0090
CrossesLittle Bayou Black
Location8.3 MI East of LA 182
RouteU.S. Route 90
Coordinates29.69009, -91.23174
Functional classUrban Other Principal 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span20 ft (6.1 m)
Deck width46 ft (13.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,885 (2021)
Projected traffic8,673 by 2041
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US0090 over Little Bayou Black built?

It was built in 1964, making it 61 years old in 2025.

What condition is US0090 over Little Bayou Black 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 February 2023.

How much traffic does US0090 over Little Bayou Black carry?

About 7,885 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is US0090 over Little Bayou Black?

The structure is 60 ft (18.3 m) long with a longest span of 20 ft (6.1 m) and a deck 46 ft wide.

Who owns US0090 over Little Bayou Black?

It is owned by the State Highway Agency.