US Bridges

LA1047 over West Natalbany Creek

FairPosted for load

St. Helena Parish, Louisiana · 0.4 M SW of LA 1048 · Structure no. 624608460803911

Built
1958
67 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
77 ft
4 main spans
Daily traffic
287
2021 count
Owner
State
State Highway Agency

About this bridge

LA1047 over West Natalbany Creek is a wood or timber stringer/multi-beam or girder carrying LA1047 over West Natalbany Creek in St. Helena 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 5 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 287 vehicles a day, roughly 13% of them trucks, projected to reach 315 by 2041. The structure is 77 ft (23.5 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLA1047
CrossesWest Natalbany Creek
Location0.4 M SW of LA 1048
RouteState Highway 1047
CountySt. Helena Parish
StateLouisiana
Coordinates30.79378, -90.589
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating25 US tons
Inventory rating16.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadH 15
Structure length77 ft (23.5 m)
Longest span19 ft (5.8 m)
Deck width28 ft (8.4 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic287 (2021)
Projected traffic315 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA1047 over West Natalbany Creek built?

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

What condition is LA1047 over West Natalbany Creek 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 November 2024.

How much traffic does LA1047 over West Natalbany Creek carry?

About 287 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA1047 over West Natalbany Creek?

The structure is 77 ft (23.5 m) long with a longest span of 19 ft (5.8 m) and a deck 28 ft wide.

Who owns LA1047 over West Natalbany Creek?

It is owned by the State Highway Agency.