US Bridges

I0012 over I-59 SB

Fair

St. Tammany Parish, Louisiana · I0012 · Structure no. 625204540432536

Built
1970
55 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
122 ft
3 main spans
Daily traffic
9,838
2021 count
Owner
State
State Highway Agency

About this bridge

I0012 over I-59 SB is a prestressed concrete stringer/multi-beam or girder carrying I0012 over I-59 SB in St. Tammany Parish, Louisiana. It was built in 1970, so it is 55 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 9,838 vehicles a day, roughly 26% of them trucks, projected to reach 10,821 by 2041. The structure is 122 ft (37.2 m) long and 32 ft wide.

Location

Open in Google Maps
CarriesI0012
CrossesI-59 SB
LocationI0012
RouteInterstate 12
CountySt. Tammany Parish
StateLouisiana
Coordinates30.30789, -89.7409
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.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87 US tons
Inventory rating46 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length122 ft (37.2 m)
Longest span53 ft (16.2 m)
Deck width32 ft (9.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,838 (2021)
Projected traffic10,821 by 2041
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$592,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I0012 over I-59 SB built?

It was built in 1970, making it 55 years old in 2025.

What condition is I0012 over I-59 SB 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 September 2023.

How much traffic does I0012 over I-59 SB carry?

About 9,838 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is I0012 over I-59 SB?

The structure is 122 ft (37.2 m) long with a longest span of 53 ft (16.2 m) and a deck 32 ft wide.

Who owns I0012 over I-59 SB?

It is owned by the State Highway Agency.