US Bridges

LA0012 over Patterson Slough

Good

Calcasieu Parish, Louisiana · 3.98 Mi. West of LA 109 · Structure no. 071000000070224

Built
2013
12 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
320 ft
8 main spans
Daily traffic
3,365
2021 count
Owner
State
State Highway Agency

About this bridge

LA0012 over Patterson Slough is a prestressed concrete stringer/multi-beam or girder carrying LA0012 over Patterson Slough in Calcasieu Parish, Louisiana. It was built in 2013, so it is 12 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 3,365 vehicles a day, roughly 18% of them trucks, projected to reach 3,701 by 2041. The structure is 320 ft (97.5 m) long and 43 ft wide. If it were closed, the detour would be 29.2 mi (47 km).

Location

Open in Google Maps
CarriesLA0012
CrossesPatterson Slough
Location3.98 Mi. West of LA 109
RouteState Highway 12
CountyCalcasieu Parish
StateLouisiana
Coordinates30.30728, -93.7252
Functional classRural Minor Arterial

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 protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
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 rating62.2 US tons
Inventory rating41.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHL 93
Structure length320 ft (97.5 m)
Longest span40 ft (12.2 m)
Deck width43 ft (13 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,365 (2021)
Projected traffic3,701 by 2041
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.2 mi (47 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 LA0012 over Patterson Slough built?

It was built in 2013, making it 12 years old in 2025.

What condition is LA0012 over Patterson Slough 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 August 2023.

How much traffic does LA0012 over Patterson Slough carry?

About 3,365 vehicles per day (2021 count), of which roughly 18% are trucks.

How long is LA0012 over Patterson Slough?

The structure is 320 ft (97.5 m) long with a longest span of 40 ft (12.2 m) and a deck 43 ft wide.

Who owns LA0012 over Patterson Slough?

It is owned by the State Highway Agency.