US Bridges

I0055 over Pass Manchac

Fair

Tangipahoa Parish, Louisiana · 11.0 M S of LA 22 · Structure no. 625304529000002

Built
1977
48 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
3,052 ft
43 main spans
Daily traffic
14,300
2016 count
Owner
State
State Highway Agency

About this bridge

I0055 over Pass Manchac is a prestressed concrete stringer/multi-beam or girder carrying I0055 over Pass Manchac in Tangipahoa 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 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 14,300 vehicles a day, roughly 25% of them trucks, projected to reach 15,730 by 2036. The structure is 3,052 ft (930.2 m) long and 43 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesI0055
CrossesPass Manchac
Location11.0 M S of LA 22
RouteInterstate 55
CountyTangipahoa Parish
StateLouisiana
Coordinates30.28948, -90.40273
Functional classRural Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans43
Design loadHS 20
Structure length3,052 ft (930.2 m)
Longest span125 ft (38.1 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,300 (2016)
Projected traffic15,730 by 2036
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I0055 over Pass Manchac built?

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

What condition is I0055 over Pass Manchac 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 May 2023.

How much traffic does I0055 over Pass Manchac carry?

About 14,300 vehicles per day (2016 count), of which roughly 25% are trucks.

How long is I0055 over Pass Manchac?

The structure is 3,052 ft (930.2 m) long with a longest span of 125 ft (38.1 m) and a deck 43 ft wide.

Who owns I0055 over Pass Manchac?

It is owned by the State Highway Agency.