US Bridges

US0071 over Twelve Mile Bayou

Fair

Caddo Parish, Louisiana · .1 MI North of LA 173 · Structure no. 040900110103131

Built
1990
35 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
488 ft
7 main spans
Daily traffic
22,553
2021 count
Owner
State
State Highway Agency

About this bridge

US0071 over Twelve Mile Bayou is a prestressed concrete continuous stringer/multi-beam or girder carrying US0071 over Twelve Mile Bayou in Caddo Parish, Louisiana. It was built in 1990, so it is 35 years old, younger 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 5 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 22,553 vehicles a day, roughly 8% of them trucks, projected to reach 24,808 by 2041. The structure is 488 ft (148.7 m) long and 85 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesUS0071
CrossesTwelve Mile Bayou
Location.1 MI North of LA 173
RouteU.S. Route 71
Coordinates32.55041, -93.7794
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating33 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length488 ft (148.7 m)
Longest span73 ft (22.3 m)
Deck width85 ft (25.8 m)
Roadway width83 ft (25.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,553 (2021)
Projected traffic24,808 by 2041
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US0071 over Twelve Mile Bayou built?

It was built in 1990, making it 35 years old in 2025.

What condition is US0071 over Twelve Mile Bayou 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 February 2024.

How much traffic does US0071 over Twelve Mile Bayou carry?

About 22,553 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is US0071 over Twelve Mile Bayou?

The structure is 488 ft (148.7 m) long with a longest span of 73 ft (22.3 m) and a deck 85 ft wide.

Who owns US0071 over Twelve Mile Bayou?

It is owned by the State Highway Agency.