US Bridges

US0171 over South Brush Bayou

Fair

Caddo Parish, Louisiana · 0.6 Mi. S. of LA 511 · Structure no. 040900250810062

Built
1986
39 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete
Length
160 ft
8 main spans
Daily traffic
16,911
2021 count
Owner
State
State Highway Agency

About this bridge

US0171 over South Brush Bayou is a concrete slab carrying US0171 over South Brush Bayou in Caddo Parish, Louisiana. It was built in 1986, so it is 39 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 16,911 vehicles a day, roughly 8% of them trucks, projected to reach 18,602 by 2041. The structure is 160 ft (48.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS0171
CrossesSouth Brush Bayou
Location0.6 Mi. S. of LA 511
RouteU.S. Route 171
CountyCaddo Parish
StateLouisiana
Coordinates32.43343, -93.78376
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating38.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span20 ft (6.1 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,911 (2021)
Projected traffic18,602 by 2041
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 US0171 over South Brush Bayou built?

It was built in 1986, making it 39 years old in 2025.

What condition is US0171 over South Brush 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 US0171 over South Brush Bayou carry?

About 16,911 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is US0171 over South Brush Bayou?

The structure is 160 ft (48.8 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns US0171 over South Brush Bayou?

It is owned by the State Highway Agency.