US Bridges

LA0124 over Slough

Good

Catahoula Parish, Louisiana · 0.7 MI N of LA 8 · Structure no. 581300410200701

Built
1977
48 years old
Condition
Good
inspected March 2023
Type
Slab
Concrete
Length
38 ft
2 main spans
Daily traffic
1,706
2021 count
Owner
State
State Highway Agency

About this bridge

LA0124 over Slough is a concrete slab carrying LA0124 over Slough in Catahoula 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 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 1,706 vehicles a day, roughly 15% of them trucks, projected to reach 1,876 by 2041. The structure is 38 ft (11.6 m) long and 31 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

CarriesLA0124
CrossesSlough
Location0.7 MI N of LA 8
RouteState Highway 124
Coordinates31.78397, -91.8257
Functional classRural Minor Collector

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 inspectionMarch 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 alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,706 (2021)
Projected traffic1,876 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 LA0124 over Slough built?

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

What condition is LA0124 over 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 March 2023.

How much traffic does LA0124 over Slough carry?

About 1,706 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is LA0124 over Slough?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns LA0124 over Slough?

It is owned by the State Highway Agency.