US Bridges

US0171 over Bayou Toro Relief

Good

Sabine Parish, Louisiana · 5.22 Mi. North of LA 392 · Structure no. 084300250204341

Built
2004
21 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete
Length
180 ft
9 main spans
Daily traffic
3,483
2021 count
Owner
State
State Highway Agency

About this bridge

US0171 over Bayou Toro Relief is a concrete slab carrying US0171 over Bayou Toro Relief in Sabine Parish, Louisiana. It was built in 2004, so it is 21 years old, younger than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,483 vehicles a day, roughly 15% of them trucks, projected to reach 3,831 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).

CarriesUS0171
CrossesBayou Toro Relief
Location5.22 Mi. North of LA 392
RouteU.S. Route 171
Coordinates31.39042, -93.4413
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating57.5 US tons
Inventory rating44.3 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 (13.1 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,483 (2021)
Projected traffic3,831 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US0171 over Bayou Toro Relief built?

It was built in 2004, making it 21 years old in 2025.

What condition is US0171 over Bayou Toro Relief in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does US0171 over Bayou Toro Relief carry?

About 3,483 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is US0171 over Bayou Toro Relief?

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 Bayou Toro Relief?

It is owned by the State Highway Agency.