US Bridges

I0055 over Little Nat River

Fair

Tangipahoa Parish, Louisiana · I0055 · Structure no. 625304529028882

Built
1968
57 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete
Length
150 ft
6 main spans
Daily traffic
21,736
2021 count
Owner
State
State Highway Agency

About this bridge

I0055 over Little Nat River is a concrete slab carrying I0055 over Little Nat River in Tangipahoa Parish, Louisiana. It was built in 1968, so it is 57 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 21,736 vehicles a day, roughly 26% of them trucks, projected to reach 23,909 by 2041. The structure is 150 ft (45.7 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI0055
CrossesLittle Nat River
LocationI0055
RouteInterstate 55
Coordinates30.67429, -90.5328
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span25 ft (7.6 m)
Deck width34 ft (10.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,736 (2021)
Projected traffic23,909 by 2041
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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$702,000
NavigationNo navigation control on waterway

Frequently asked questions

When was I0055 over Little Nat River built?

It was built in 1968, making it 57 years old in 2025.

What condition is I0055 over Little Nat 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 January 2025.

How much traffic does I0055 over Little Nat River carry?

About 21,736 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is I0055 over Little Nat River?

The structure is 150 ft (45.7 m) long with a longest span of 25 ft (7.6 m) and a deck 34 ft wide.

Who owns I0055 over Little Nat River?

It is owned by the State Highway Agency.