US Bridges

LA0512 over San Patricio Bayou

Fair

De Soto Parish, Louisiana · 2.21 MI East of LA 171 · Structure no. 041603010202211

Built
1957
68 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
240 ft
12 main spans
Daily traffic
215
2021 count
Owner
State
State Highway Agency

About this bridge

LA0512 over San Patricio Bayou is a concrete slab carrying LA0512 over San Patricio Bayou in De Soto Parish, Louisiana. It was built in 1957, so it is 68 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 215 vehicles a day, roughly 25% of them trucks, projected to reach 236 by 2041. The structure is 240 ft (73.2 m) long and 30 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesLA0512
CrossesSan Patricio Bayou
Location2.21 MI East of LA 171
RouteState Highway 512
CountyDe Soto Parish
StateLouisiana
Coordinates31.8746, -93.65951
Functional classRural Minor Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43 US tons
Inventory rating26 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans12
Design loadH 15
Structure length240 ft (73.2 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic215 (2021)
Projected traffic236 by 2041
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 LA0512 over San Patricio Bayou built?

It was built in 1957, making it 68 years old in 2025.

What condition is LA0512 over San Patricio 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 May 2024.

How much traffic does LA0512 over San Patricio Bayou carry?

About 215 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is LA0512 over San Patricio Bayou?

The structure is 240 ft (73.2 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns LA0512 over San Patricio Bayou?

It is owned by the State Highway Agency.