US Bridges

I0055 over Swamp

Fair

St. John the Baptist Parish, Louisiana · 12.30 Miles North of JCT · Structure no. 624800000620248

Built
2008
17 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
129 ft
3 main spans
Daily traffic
27,551
2021 count
Owner
State
State Highway Agency

About this bridge

I0055 over Swamp is a prestressed concrete stringer/multi-beam or girder carrying I0055 over Swamp in St. John the Baptist Parish, Louisiana. It was built in 2008, so it is 17 years old, younger 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 27,551 vehicles a day, roughly 25% of them trucks, projected to reach 30,306 by 2041. The structure is 129 ft (39.3 m) long and 55 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesI0055
CrossesSwamp
Location12.30 Miles North of JCT
RouteInterstate 55
CountySt. John the Baptist Parish
StateLouisiana
Coordinates30.25248, -90.40341
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.2 US tons
Inventory rating28.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length129 ft (39.3 m)
Longest span43 ft (13.1 m)
Deck width55 ft (16.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,551 (2021)
Projected traffic30,306 by 2041
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I0055 over Swamp built?

It was built in 2008, making it 17 years old in 2025.

What condition is I0055 over Swamp 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 June 2023.

How much traffic does I0055 over Swamp carry?

About 27,551 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is I0055 over Swamp?

The structure is 129 ft (39.3 m) long with a longest span of 43 ft (13.1 m) and a deck 55 ft wide.

Who owns I0055 over Swamp?

It is owned by the State Highway Agency.