US Bridges

LA0506 over Castor Creek

Fair

Caldwell Parish, Louisiana · 6.4 MI West of US 165 · Structure no. 581103450301291

Built
1975
50 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete
Length
209 ft
11 main spans
Daily traffic
306
2021 count
Owner
State
State Highway Agency

About this bridge

LA0506 over Castor Creek is a concrete slab carrying LA0506 over Castor Creek in Caldwell Parish, Louisiana. It was built in 1975, so it is 50 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 306 vehicles a day, roughly 11% of them trucks, projected to reach 336 by 2041. The structure is 209 ft (63.7 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesLA0506
CrossesCastor Creek
Location6.4 MI West of US 165
RouteState Highway 506
CountyCaldwell Parish
StateLouisiana
Coordinates31.98519, -92.2458
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 inspectionJuly 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans11
Design loadHS 20
Structure length209 ft (63.7 m)
Longest span19 ft (5.8 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic306 (2021)
Projected traffic336 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 LA0506 over Castor Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is LA0506 over Castor Creek 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 July 2023.

How much traffic does LA0506 over Castor Creek carry?

About 306 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA0506 over Castor Creek?

The structure is 209 ft (63.7 m) long with a longest span of 19 ft (5.8 m) and a deck 32 ft wide.

Who owns LA0506 over Castor Creek?

It is owned by the State Highway Agency.