US Bridges

US0090 over On-Ramp

Good

St. Mary Parish, Louisiana · 0.14 MI W of LA 182 · Structure no. 035104240532151

Built
1977
48 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,183 ft
16 main spans
Daily traffic
7,885
2021 count
Owner
State
State Highway Agency

About this bridge

US0090 over On-Ramp is a prestressed concrete stringer/multi-beam or girder carrying US0090 over On-Ramp in St. Mary Parish, Louisiana. It was built in 1977, so it is 48 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,885 vehicles a day, roughly 14% of them trucks, projected to reach 8,673 by 2041. The structure is 1,183 ft (360.6 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS0090
CrossesOn-Ramp
Location0.14 MI W of LA 182
RouteU.S. Route 90
Coordinates29.69149, -91.22492
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans16
Design loadHS 20
Structure length1,183 ft (360.6 m)
Longest span100 ft (30.5 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,885 (2021)
Projected traffic8,673 by 2041
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US0090 over On-Ramp built?

It was built in 1977, making it 48 years old in 2025.

What condition is US0090 over On-Ramp in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.

How much traffic does US0090 over On-Ramp carry?

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

How long is US0090 over On-Ramp?

The structure is 1,183 ft (360.6 m) long with a longest span of 100 ft (30.5 m) and a deck 41 ft wide.

Who owns US0090 over On-Ramp?

It is owned by the State Highway Agency.