US Bridges

LA 450 over North Carson Creek

Good

Washington Parish, Louisiana · 2.5 Miles North of LA 10 · Structure no. 625900000625906

Built
2023
2 years old
Condition
Good
inspected March 2024
Type
Culvert
Concrete
Length
50 ft
4 main spans
Daily traffic
1,162
2021 count
Owner
State
State Highway Agency

About this bridge

LA 450 over North Carson Creek is a concrete culvert carrying LA 450 over North Carson Creek in Washington Parish, Louisiana. It was built in 2023, so it is 2 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,162 vehicles a day, roughly 13% of them trucks, projected to reach 1,278 by 2041. The structure is 50 ft (15.2 m) long and 48 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesLA 450
CrossesNorth Carson Creek
Location2.5 Miles North of LA 10
RouteState Highway 450
Coordinates30.85164, -90.28715
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection9 ExcellentNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.5 US tons
Inventory rating40.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4 (+2 approach)
Design loadGreater than HL 93
Structure length50 ft (15.2 m)
Longest span10 ft (3 m)
Deck width48 ft (14.6 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,162 (2021)
Projected traffic1,278 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA 450 over North Carson Creek built?

It was built in 2023, making it 2 years old in 2025.

What condition is LA 450 over North Carson Creek 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 2024.

How much traffic does LA 450 over North Carson Creek carry?

About 1,162 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA 450 over North Carson Creek?

The structure is 50 ft (15.2 m) long with a longest span of 10 ft (3 m) and a deck 48 ft wide.

Who owns LA 450 over North Carson Creek?

It is owned by the State Highway Agency.