US Bridges

LA0478 over Bayou Demuse Relief

Good

Natchitoches Parish, Louisiana · 2.33 Mi. West of LA 117 · Structure no. 083501160202931

Built
1996
29 years old
Condition
Good
inspected March 2024
Type
Culvert
Steel
Length
27 ft
3 main spans
Daily traffic
60
2021 count
Owner
State
State Highway Agency

About this bridge

LA0478 over Bayou Demuse Relief is a steel culvert carrying LA0478 over Bayou Demuse Relief in Natchitoches Parish, Louisiana. It was built in 1996, so it is 29 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 60 vehicles a day, roughly 14% of them trucks, projected to reach 66 by 2041. The structure is 27 ft (8.2 m) long and 82 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesLA0478
CrossesBayou Demuse Relief
Location2.33 Mi. West of LA 117
RouteState Highway 478
Coordinates31.56242, -93.2413
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating82.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span7 ft (2.1 m)
Deck width82 ft (25 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2021)
Projected traffic66 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0478 over Bayou Demuse Relief built?

It was built in 1996, making it 29 years old in 2025.

What condition is LA0478 over Bayou Demuse Relief 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 LA0478 over Bayou Demuse Relief carry?

About 60 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA0478 over Bayou Demuse Relief?

The structure is 27 ft (8.2 m) long with a longest span of 7 ft (2.1 m) and a deck 82 ft wide.

Who owns LA0478 over Bayou Demuse Relief?

It is owned by the State Highway Agency.