US Bridges

LA0174 over Bayou-San-Patricio

Poor

Sabine Parish, Louisiana · 0.44 M. E. of US 171 · Structure no. 084301120300441

Built
1977
48 years old
Condition
Poor
inspected August 2024
Type
Slab
Concrete
Length
266 ft
14 main spans
Daily traffic
1,099
2021 count
Owner
State
State Highway Agency

About this bridge

LA0174 over Bayou-San-Patricio is a concrete slab carrying LA0174 over Bayou-San-Patricio in Sabine Parish, Louisiana. It was built in 1977, so it is 48 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,099 vehicles a day, roughly 14% of them trucks, projected to reach 1,208 by 2041. The structure is 266 ft (81.1 m) long and 35 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesLA0174
CrossesBayou-San-Patricio
Location0.44 M. E. of US 171
RouteState Highway 174
CountySabine Parish
StateLouisiana
Coordinates31.7822, -93.6869
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating32.2 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans14
Design loadHS 20
Structure length266 ft (81.1 m)
Longest span19 ft (5.8 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,099 (2021)
Projected traffic1,208 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 LA0174 over Bayou-San-Patricio built?

It was built in 1977, making it 48 years old in 2025.

What condition is LA0174 over Bayou-San-Patricio in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does LA0174 over Bayou-San-Patricio carry?

About 1,099 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA0174 over Bayou-San-Patricio?

The structure is 266 ft (81.1 m) long with a longest span of 19 ft (5.8 m) and a deck 35 ft wide.

Who owns LA0174 over Bayou-San-Patricio?

It is owned by the State Highway Agency.