US Bridges

LA0450 over Marys Branch

FairPosted for load

St. Tammany Parish, Louisiana · 2.5 M NW of LA 25 · Structure no. 625208520703031

Built
1958
67 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
58 ft
3 main spans
Daily traffic
1,822
2021 count
Owner
State
State Highway Agency

About this bridge

LA0450 over Marys Branch is a wood or timber stringer/multi-beam or girder carrying LA0450 over Marys Branch in St. Tammany Parish, Louisiana. It was built in 1958, so it is 67 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. Its operating status is: posted for load restriction.

It carries about 1,822 vehicles a day, roughly 13% of them trucks, projected to reach 2,004 by 2041. The structure is 58 ft (17.7 m) long and 26 ft wide.

Location

Open in Google Maps
CarriesLA0450
CrossesMarys Branch
Location2.5 M NW of LA 25
RouteState Highway 450
CountySt. Tammany Parish
StateLouisiana
Coordinates30.70577, -90.2252
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28 US tons
Inventory rating20 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 15
Structure length58 ft (17.7 m)
Longest span19 ft (5.8 m)
Deck width26 ft (8 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,822 (2021)
Projected traffic2,004 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 LA0450 over Marys Branch built?

It was built in 1958, making it 67 years old in 2025.

What condition is LA0450 over Marys 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 October 2023.

How much traffic does LA0450 over Marys Branch carry?

About 1,822 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA0450 over Marys Branch?

The structure is 58 ft (17.7 m) long with a longest span of 19 ft (5.8 m) and a deck 26 ft wide.

Who owns LA0450 over Marys Branch?

It is owned by the State Highway Agency.