US Bridges

US0171 over Cypress Bayou

Fair

Caddo Parish, Louisiana · 1.3 Mi. N. of LA 3276 · Structure no. 040900250800001

Built
1981
44 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete
Length
180 ft
9 main spans
Daily traffic
10,623
2021 count
Owner
State
State Highway Agency

About this bridge

US0171 over Cypress Bayou is a concrete slab carrying US0171 over Cypress Bayou in Caddo Parish, Louisiana. It was built in 1981, so it is 44 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 10,623 vehicles a day, roughly 18% of them trucks, projected to reach 11,685 by 2041. The structure is 180 ft (54.9 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
CrossesCypress Bayou
Location1.3 Mi. N. of LA 3276
RouteU.S. Route 171
CountyCaddo Parish
StateLouisiana
Coordinates32.30007, -93.82786
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64 US tons
Inventory rating39 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length180 ft (54.9 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 traffic10,623 (2021)
Projected traffic11,685 by 2041
Trucks18%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 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 Cypress Bayou built?

It was built in 1981, making it 44 years old in 2025.

What condition is US0171 over Cypress 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 Cypress Bayou carry?

About 10,623 vehicles per day (2021 count), of which roughly 18% are trucks.

How long is US0171 over Cypress Bayou?

The structure is 180 ft (54.9 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns US0171 over Cypress Bayou?

It is owned by the State Highway Agency.