US Bridges

LA0169 over Twelve Mile Bayou

PoorPosted for load

Caddo Parish, Louisiana · 1.6 MI East of LA 1 · Structure no. 040900453103201

Built
1955
70 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
492 ft
10 main spans
Daily traffic
311
2021 count
Owner
State
State Highway Agency

About this bridge

LA0169 over Twelve Mile Bayou is a steel stringer/multi-beam or girder carrying LA0169 over Twelve Mile Bayou in Caddo Parish, Louisiana. It was built in 1955, so it is 70 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 311 vehicles a day, roughly 19% of them trucks, projected to reach 342 by 2041. The structure is 492 ft (150 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesLA0169
CrossesTwelve Mile Bayou
Location1.6 MI East of LA 1
RouteState Highway 169
Coordinates32.69968, -93.9114
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25 US tons
Inventory rating19.3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans10
Design loadH 15
Structure length492 ft (150 m)
Longest span70 ft (21.3 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic311 (2021)
Projected traffic342 by 2041
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

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$2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0169 over Twelve Mile Bayou built?

It was built in 1955, making it 70 years old in 2025.

What condition is LA0169 over Twelve Mile Bayou in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does LA0169 over Twelve Mile Bayou carry?

About 311 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is LA0169 over Twelve Mile Bayou?

The structure is 492 ft (150 m) long with a longest span of 70 ft (21.3 m) and a deck 30 ft wide.

Who owns LA0169 over Twelve Mile Bayou?

It is owned by the State Highway Agency.