US Bridges

I0012 over Bayou Liberty

Good

St. Tammany Parish, Louisiana · I0012 · Structure no. 625204540426912

Built
1972
53 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
160 ft
3 main spans
Daily traffic
29,236
2021 count
Owner
State
State Highway Agency

About this bridge

I0012 over Bayou Liberty is a prestressed concrete stringer/multi-beam or girder carrying I0012 over Bayou Liberty 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 29,236 vehicles a day, roughly 26% of them trucks, projected to reach 32,159 by 2041. The structure is 160 ft (48.8 m) long and 42 ft wide.

Location

Open in Google Maps
CarriesI0012
CrossesBayou Liberty
LocationI0012
RouteInterstate 12
CountySt. Tammany Parish
StateLouisiana
Coordinates30.31674, -89.8354
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span53 ft (16.2 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,236 (2021)
Projected traffic32,159 by 2041
Trucks26%
Lanes on structure2
Traffic directionOne-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 Bayou Liberty built?

It was built in 1972, making it 53 years old in 2025.

What condition is I0012 over Bayou Liberty 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 Bayou Liberty carry?

About 29,236 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is I0012 over Bayou Liberty?

The structure is 160 ft (48.8 m) long with a longest span of 53 ft (16.2 m) and a deck 42 ft wide.

Who owns I0012 over Bayou Liberty?

It is owned by the State Highway Agency.