US Bridges

I0049 over Twelve Mile Bayou

Good

Caddo Parish, Louisiana · 2.11 MI N of LA 1 · Structure no. 040900000040346

Built
2013
12 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
1,224 ft
12 main spans
Daily traffic
6,846
2021 count
Owner
State
State Highway Agency

About this bridge

I0049 over Twelve Mile Bayou is a prestressed concrete continuous stringer/multi-beam or girder carrying I0049 over Twelve Mile Bayou in Caddo Parish, Louisiana. It was built in 2013, so it is 12 years old, younger 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 6,846 vehicles a day, roughly 36% of them trucks, projected to reach 7,530 by 2041. The structure is 1,224 ft (373.1 m) long and 42 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesI0049
CrossesTwelve Mile Bayou
Location2.11 MI N of LA 1
RouteInterstate 49
Coordinates32.6277, -93.8371
Functional classRural 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating49.6 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans12
Design loadHS 20
Structure length1,224 ft (373.1 m)
Longest span102 ft (31.1 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,846 (2021)
Projected traffic7,530 by 2041
Trucks36%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I0049 over Twelve Mile Bayou built?

It was built in 2013, making it 12 years old in 2025.

What condition is I0049 over Twelve Mile Bayou 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 April 2024.

How much traffic does I0049 over Twelve Mile Bayou carry?

About 6,846 vehicles per day (2021 count), of which roughly 36% are trucks.

How long is I0049 over Twelve Mile Bayou?

The structure is 1,224 ft (373.1 m) long with a longest span of 102 ft (31.1 m) and a deck 42 ft wide.

Who owns I0049 over Twelve Mile Bayou?

It is owned by the State Highway Agency.