US Bridges

LA1247 over Bayou Lafourche

Fair

Assumption Parish, Louisiana · LA0398 · Structure no. 610408043500011

Built
1953
72 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
223 ft
6 main spans
Daily traffic
1,038
2021 count
Owner
State
State Highway Agency

About this bridge

LA1247 over Bayou Lafourche is a steel stringer/multi-beam or girder carrying LA1247 over Bayou Lafourche in Assumption Parish, Louisiana. It was built in 1953, so it is 72 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.

It carries about 1,038 vehicles a day, roughly 11% of them trucks, projected to reach 1,141 by 2041. The structure is 223 ft (68 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesLA1247
CrossesBayou Lafourche
LocationLA0398
RouteState Highway 1247
CountyAssumption Parish
StateLouisiana
Coordinates29.84026, -90.95402
Functional classUrban 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckOpen grating
Main spans6
Design loadH 15
Structure length223 ft (68 m)
Longest span65 ft (19.8 m)
Deck width35 ft (10.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,038 (2021)
Projected traffic1,141 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 LA1247 over Bayou Lafourche built?

It was built in 1953, making it 72 years old in 2025.

What condition is LA1247 over Bayou Lafourche 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 August 2023.

How much traffic does LA1247 over Bayou Lafourche carry?

About 1,038 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is LA1247 over Bayou Lafourche?

The structure is 223 ft (68 m) long with a longest span of 65 ft (19.8 m) and a deck 35 ft wide.

Who owns LA1247 over Bayou Lafourche?

It is owned by the State Highway Agency.