I0012 over Drainage

Fair

St. Tammany Parish, Louisiana · 1.5 M E of US 11 · Structure no. 625204540432383

Built: 1970; 55 years old
Condition: Fair; inspected September 2023
Type: Culvert; Concrete
Length: 30 ft; 3 main spans
Daily traffic: 9,838; 2021 count
Owner: State; State Highway Agency

About this bridge

I0012 over Drainage is a concrete culvert carrying I0012 over Drainage 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 9% of them trucks, projected to reach 10,821 by 2041. The structure is 30 ft (9.1 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI0012

CrossesDrainage

Location1.5 M E of US 11

RouteInterstate 12

CountySt. Tammany Parish

StateLouisiana

Coordinates30.30604, -89.74393

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.

Component	Rating	Meaning
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.
Culvert	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionSeptember 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation6: Equal to present minimum criteria

Deck geometry7: Better than present minimum 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 spans3

Design loadHS 20

Structure length30 ft (9.1 m)

Longest span8 ft (2.4 m)

Deck width24 ft (7.3 m)

Roadway width24 ft (7.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,838 (2021)

Projected traffic10,821 by 2041

Trucks9%

Lanes on structure1

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 Drainage built?

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

What condition is I0012 over Drainage 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 Drainage carry?

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

How long is I0012 over Drainage?

The structure is 30 ft (9.1 m) long with a longest span of 8 ft (2.4 m) and a deck 24 ft wide.

Who owns I0012 over Drainage?

It is owned by the State Highway Agency.