US Bridges

LA0575 over Shackleford Lake

Fair

Tensas Parish, Louisiana · 6.8 MI North of LA 4 · Structure no. 585403510106781

Built
1978
47 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete
Length
57 ft
3 main spans
Daily traffic
26
2021 count
Owner
State
State Highway Agency

About this bridge

LA0575 over Shackleford Lake is a concrete slab carrying LA0575 over Shackleford Lake in Tensas Parish, Louisiana. It was built in 1978, so it is 47 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 26 vehicles a day, roughly 11% of them trucks, projected to reach 28 by 2041. The structure is 57 ft (17.4 m) long and 36 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesLA0575
CrossesShackleford Lake
Location6.8 MI North of LA 4
RouteState Highway 575
CountyTensas Parish
StateLouisiana
Coordinates32.15045, -91.3008
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.8 US tons
Inventory rating25.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span19 ft (5.8 m)
Deck width36 ft (11 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2021)
Projected traffic28 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$312,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0575 over Shackleford Lake built?

It was built in 1978, making it 47 years old in 2025.

What condition is LA0575 over Shackleford Lake 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 February 2023.

How much traffic does LA0575 over Shackleford Lake carry?

About 26 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0575 over Shackleford Lake?

The structure is 57 ft (17.4 m) long with a longest span of 19 ft (5.8 m) and a deck 36 ft wide.

Who owns LA0575 over Shackleford Lake?

It is owned by the State Highway Agency.