US Bridges

LA0070 over Bayou Napoleon

Fair

Assumption Parish, Louisiana · 0.8 M SW of LA 3127 · Structure no. 610402323006611

Built
1972
53 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
80 ft
4 main spans
Daily traffic
11,166
2021 count
Owner
State
State Highway Agency

About this bridge

LA0070 over Bayou Napoleon is a concrete slab carrying LA0070 over Bayou Napoleon in Assumption Parish, Louisiana. It was built in 1972, so it is 53 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 11,166 vehicles a day, roughly 18% of them trucks, projected to reach 12,282 by 2041. The structure is 80 ft (24.4 m) long and 48 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesLA0070
CrossesBayou Napoleon
Location0.8 M SW of LA 3127
RouteState Highway 70
CountyAssumption Parish
StateLouisiana
Coordinates30.05889, -90.97525
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span20 ft (6.1 m)
Deck width48 ft (14.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,166 (2021)
Projected traffic12,282 by 2041
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 LA0070 over Bayou Napoleon built?

It was built in 1972, making it 53 years old in 2025.

What condition is LA0070 over Bayou Napoleon 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 April 2023.

How much traffic does LA0070 over Bayou Napoleon carry?

About 11,166 vehicles per day (2021 count), of which roughly 18% are trucks.

How long is LA0070 over Bayou Napoleon?

The structure is 80 ft (24.4 m) long with a longest span of 20 ft (6.1 m) and a deck 48 ft wide.

Who owns LA0070 over Bayou Napoleon?

It is owned by the State Highway Agency.