US Bridges

I0055 over LA 16

Fair

Tangipahoa Parish, Louisiana · I0055 · Structure no. 625304529032471

Built
1970
55 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
170 ft
4 main spans
Daily traffic
21,762
2021 count
Owner
State
State Highway Agency

About this bridge

I0055 over LA 16 is a prestressed concrete stringer/multi-beam or girder carrying I0055 over LA 16 in Tangipahoa Parish, Louisiana. It was built in 1970, so it is 55 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 21,762 vehicles a day, roughly 26% of them trucks, projected to reach 23,938 by 2041. The structure is 170 ft (51.8 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI0055
CrossesLA 16
LocationI0055
RouteInterstate 55
CountyTangipahoa Parish
StateLouisiana
Coordinates30.72609, -90.5327
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93 US tons
Inventory rating49.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length170 ft (51.8 m)
Longest span55 ft (16.8 m)
Deck width34 ft (10.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,762 (2021)
Projected traffic23,938 by 2041
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$780,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I0055 over LA 16 built?

It was built in 1970, making it 55 years old in 2025.

What condition is I0055 over LA 16 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 January 2025.

How much traffic does I0055 over LA 16 carry?

About 21,762 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is I0055 over LA 16?

The structure is 170 ft (51.8 m) long with a longest span of 55 ft (16.8 m) and a deck 34 ft wide.

Who owns I0055 over LA 16?

It is owned by the State Highway Agency.