US Bridges

I0012 over Tchefuncte River

Fair

St. Tammany Parish, Louisiana · 1.1 Miles East of LA 21 · Structure no. 625204540407961

Built
1975
50 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
1,409 ft
1 main span
Daily traffic
79,563
2021 count
Owner
State
State Highway Agency

About this bridge

I0012 over Tchefuncte River is a steel stringer/multi-beam or girder carrying I0012 over Tchefuncte River in St. Tammany Parish, Louisiana. It was built in 1975, so it is 50 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 79,563 vehicles a day, roughly 26% of them trucks, projected to reach 87,519 by 2041. The structure is 1,409 ft (429.5 m) long and 74 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesI0012
CrossesTchefuncte River
Location1.1 Miles East of LA 21
RouteInterstate 12
CountySt. Tammany Parish
StateLouisiana
Coordinates30.4398, -90.1195
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 rating42.1 US tons
Inventory rating32.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+20 approach)
Design loadHS 20
Structure length1,409 ft (429.5 m)
Longest span111 ft (33.8 m)
Deck width74 ft (22.7 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic79,563 (2021)
Projected traffic87,519 by 2041
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed6.8 mi (11 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 I0012 over Tchefuncte River built?

It was built in 1975, making it 50 years old in 2025.

What condition is I0012 over Tchefuncte 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 July 2023.

How much traffic does I0012 over Tchefuncte River carry?

About 79,563 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is I0012 over Tchefuncte River?

The structure is 1,409 ft (429.5 m) long with a longest span of 111 ft (33.8 m) and a deck 74 ft wide.

Who owns I0012 over Tchefuncte River?

It is owned by the State Highway Agency.