US Bridges

US0090 over Atchafalaya River

Fair

St. Mary Parish, Louisiana · .3 Miles E of LA 182 Ramp · Structure no. 035104240532701

Built
1975
50 years old
Condition
Fair
inspected March 2023
Type
Truss - Thru
Steel Continuous
Length
1,839 ft
3 main spans
Daily traffic
7,885
2021 count
Owner
State
State Highway Agency

About this bridge

US0090 over Atchafalaya River is a steel continuous truss - thru carrying US0090 over Atchafalaya River in St. Mary Parish, Louisiana. It was built in 1975, so it is 50 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 7,885 vehicles a day, roughly 14% of them trucks, projected to reach 8,673 by 2041. The structure is 1,839 ft (560.5 m) long and 79 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS0090
CrossesAtchafalaya River
Location.3 Miles E of LA 182 Ramp
RouteU.S. Route 90
CountySt. Mary Parish
StateLouisiana
Coordinates29.69446, -91.2169
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
Deck7 GoodSome minor problems.
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 protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating41.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length1,839 ft (560.5 m)
Longest span617 ft (188.1 m)
Deck width79 ft (24.1 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deck30 ft (9.1 m)

Traffic and service

Average daily traffic7,885 (2021)
Projected traffic8,673 by 2041
Trucks14%
Lanes on structure4
Traffic directionTwo-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$12.2 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US0090 over Atchafalaya River built?

It was built in 1975, making it 50 years old in 2025.

What condition is US0090 over Atchafalaya River 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 March 2023.

How much traffic does US0090 over Atchafalaya River carry?

About 7,885 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is US0090 over Atchafalaya River?

The structure is 1,839 ft (560.5 m) long with a longest span of 617 ft (188.1 m) and a deck 79 ft wide.

Who owns US0090 over Atchafalaya River?

It is owned by the State Highway Agency.