US Bridges

LA0173 over Logan Bayou

Fair

Caddo Parish, Louisiana · 5.7 MI East of LA 3094 · Structure no. 040900940107421

Built
1963
62 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
31 ft
4 main spans
Daily traffic
15,302
2021 count
Owner
State
State Highway Agency

About this bridge

LA0173 over Logan Bayou is a concrete culvert carrying LA0173 over Logan Bayou in Caddo Parish, Louisiana. It was built in 1963, so it is 62 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 15,302 vehicles a day, roughly 10% of them trucks, projected to reach 16,832 by 2041. The structure is 31 ft (9.4 m) long and 55 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesLA0173
CrossesLogan Bayou
Location5.7 MI East of LA 3094
RouteState Highway 173
Coordinates32.55164, -93.8437
Functional classUrban Minor 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span7 ft (2.1 m)
Deck width55 ft (16.8 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,302 (2021)
Projected traffic16,832 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0173 over Logan Bayou built?

It was built in 1963, making it 62 years old in 2025.

What condition is LA0173 over Logan 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 January 2024.

How much traffic does LA0173 over Logan Bayou carry?

About 15,302 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is LA0173 over Logan Bayou?

The structure is 31 ft (9.4 m) long with a longest span of 7 ft (2.1 m) and a deck 55 ft wide.

Who owns LA0173 over Logan Bayou?

It is owned by the State Highway Agency.