US Bridges

LA 25 over West Prong Bogue Falaya

Fair

St. Tammany Parish, Louisiana · 1.9 Miles NE of LA 450 · Structure no. 625200590217001

Built
1963
62 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
180 ft
9 main spans
Daily traffic
9,685
2021 count
Owner
State
State Highway Agency

About this bridge

LA 25 over West Prong Bogue Falaya is a concrete slab carrying LA 25 over West Prong Bogue Falaya in St. Tammany Parish, Louisiana. It was built in 1963, so it is 62 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 9,685 vehicles a day, roughly 11% of them trucks, projected to reach 10,653 by 2041. The structure is 180 ft (54.9 m) long and 33 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesLA 25
CrossesWest Prong Bogue Falaya
Location1.9 Miles NE of LA 450
RouteState Highway 25
CountySt. Tammany Parish
StateLouisiana
Coordinates30.6885, -90.1839
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span20 ft (6.1 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,685 (2021)
Projected traffic10,653 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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$819,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA 25 over West Prong Bogue Falaya built?

It was built in 1963, making it 62 years old in 2025.

What condition is LA 25 over West Prong Bogue Falaya 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 September 2023.

How much traffic does LA 25 over West Prong Bogue Falaya carry?

About 9,685 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA 25 over West Prong Bogue Falaya?

The structure is 180 ft (54.9 m) long with a longest span of 20 ft (6.1 m) and a deck 33 ft wide.

Who owns LA 25 over West Prong Bogue Falaya?

It is owned by the State Highway Agency.