US Bridges

US0171 over English Bayou

Fair

Calcasieu Parish, Louisiana · 0.4 MI S of LA 3059 · Structure no. 071000240102602

Built
1969
56 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
947 ft
14 main spans
Daily traffic
18,040
2021 count
Owner
State
State Highway Agency

About this bridge

US0171 over English Bayou is a prestressed concrete stringer/multi-beam or girder carrying US0171 over English Bayou in Calcasieu Parish, Louisiana. It was built in 1969, so it is 56 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 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 18,040 vehicles a day, roughly 17% of them trucks, projected to reach 19,844 by 2041. The structure is 947 ft (288.6 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS0171
CrossesEnglish Bayou
Location0.4 MI S of LA 3059
RouteU.S. Route 171
CountyCalcasieu Parish
StateLouisiana
Coordinates30.27322, -93.1827
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans14
Design loadHS 20
Structure length947 ft (288.6 m)
Longest span100 ft (30.5 m)
Deck width31 ft (9.4 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,040 (2021)
Projected traffic19,844 by 2041
Trucks17%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.7 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US0171 over English Bayou built?

It was built in 1969, making it 56 years old in 2025.

What condition is US0171 over English 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 April 2023.

How much traffic does US0171 over English Bayou carry?

About 18,040 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is US0171 over English Bayou?

The structure is 947 ft (288.6 m) long with a longest span of 100 ft (30.5 m) and a deck 31 ft wide.

Who owns US0171 over English Bayou?

It is owned by the State Highway Agency.