US Bridges

I0012 over Big Branch

Fair

Livingston Parish, Louisiana · I0012 · Structure no. 623204540220121

Built
1969
56 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete
Length
150 ft
6 main spans
Daily traffic
75,867
2021 count
Owner
State
State Highway Agency

About this bridge

I0012 over Big Branch is a concrete slab carrying I0012 over Big Branch in Livingston Parish, Louisiana. It was built in 1969, so it is 56 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 75,867 vehicles a day, roughly 25% of them trucks, projected to reach 83,453 by 2041. The structure is 150 ft (45.7 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI0012
CrossesBig Branch
LocationI0012
RouteInterstate 12
Coordinates30.47454, -90.6538
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81 US tons
Inventory rating49.1 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 width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75,867 (2021)
Projected traffic83,453 by 2041
Trucks25%
Lanes on structure3
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I0012 over Big Branch built?

It was built in 1969, making it 56 years old in 2025.

What condition is I0012 over Big Branch 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 February 2024.

How much traffic does I0012 over Big Branch carry?

About 75,867 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is I0012 over Big Branch?

The structure is 150 ft (45.7 m) long with a longest span of 25 ft (7.6 m) and a deck 63 ft wide.

Who owns I0012 over Big Branch?

It is owned by the State Highway Agency.