US Bridges

LA0439 over Miller Branch

Fair

Washington Parish, Louisiana · On LA439 5.5MI. S of Laid · Structure no. 625908592205471

Built
1964
61 years old
Condition
Fair
inspected May 2024
Type
Culvert
Steel
Length
40 ft
4 main spans
Daily traffic
1,235
2021 count
Owner
State
State Highway Agency

About this bridge

LA0439 over Miller Branch is a steel culvert carrying LA0439 over Miller Branch in Washington Parish, Louisiana. It was built in 1964, so it is 61 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 6 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 1,235 vehicles a day, roughly 13% of them trucks, projected to reach 1,358 by 2041. The structure is 40 ft (12.2 m) long and 50 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesLA0439
CrossesMiller Branch
LocationOn LA439 5.5MI. S of Laid
RouteState Highway 439
Coordinates30.79635, -89.9876
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating94.2 US tons
Inventory rating82.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans4
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span8 ft (2.4 m)
Deck width50 ft (15.2 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,235 (2021)
Projected traffic1,358 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byBureau of Indian Affairs
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was LA0439 over Miller Branch built?

It was built in 1964, making it 61 years old in 2025.

What condition is LA0439 over Miller Branch 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 May 2024.

How much traffic does LA0439 over Miller Branch carry?

About 1,235 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA0439 over Miller Branch?

The structure is 40 ft (12.2 m) long with a longest span of 8 ft (2.4 m) and a deck 50 ft wide.

Who owns LA0439 over Miller Branch?

It is owned by the State Highway Agency and maintained by the Bureau of Indian Affairs.