US Bridges

I0012 over Big Branch

Good

St. Tammany Parish, Louisiana · I0012 · Structure no. 625204540423051

Built
1972
53 years old
Condition
Good
inspected August 2023
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
78,974
2021 count
Owner
State
State Highway Agency

About this bridge

I0012 over Big Branch is a concrete culvert carrying I0012 over Big Branch in St. Tammany Parish, Louisiana. It was built in 1972, so it is 53 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 78,974 vehicles a day, roughly 26% of them trucks, projected to reach 86,871 by 2041. The structure is 22 ft (6.7 m) long and 270 ft wide.

CarriesI0012
CrossesBig Branch
LocationI0012
RouteInterstate 12
Coordinates30.33896, -89.8956
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width270 ft (82.3 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic78,974 (2021)
Projected traffic86,871 by 2041
Trucks26%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 1972, making it 53 years old in 2025.

What condition is I0012 over Big Branch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does I0012 over Big Branch carry?

About 78,974 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is I0012 over Big Branch?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 270 ft wide.

Who owns I0012 over Big Branch?

It is owned by the State Highway Agency.