US Bridges

LA0070 over Grand Bayou

Fair

Assumption Parish, Louisiana · LA0070 · Structure no. 610402320104941

Built
1958
67 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
152 ft
5 main spans
Daily traffic
5,760
2021 count
Owner
State
State Highway Agency

About this bridge

LA0070 over Grand Bayou is a concrete slab carrying LA0070 over Grand Bayou in Assumption 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.

It carries about 5,760 vehicles a day, roughly 18% of them trucks, projected to reach 6,336 by 2041. The structure is 152 ft (46.3 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesLA0070
CrossesGrand Bayou
LocationLA0070
RouteState Highway 70
CountyAssumption Parish
StateLouisiana
Coordinates30.01543, -91.13117
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 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
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans5 (+3 approach)
Design loadHS 20
Structure length152 ft (46.3 m)
Longest span19 ft (5.8 m)
Deck width36 ft (11 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,760 (2021)
Projected traffic6,336 by 2041
Trucks18%
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 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$709,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0070 over Grand Bayou built?

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

What condition is LA0070 over Grand Bayou 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 LA0070 over Grand Bayou carry?

About 5,760 vehicles per day (2021 count), of which roughly 18% are trucks.

How long is LA0070 over Grand Bayou?

The structure is 152 ft (46.3 m) long with a longest span of 19 ft (5.8 m) and a deck 36 ft wide.

Who owns LA0070 over Grand Bayou?

It is owned by the State Highway Agency.