US Bridges

LA3070 over Bayou Jonas

Fair

Acadia Parish, Louisiana · 1.73 MI North of LA 100 · Structure no. 030108015901731

Built
1980
45 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete
Length
38 ft
2 main spans
Daily traffic
956
2021 count
Owner
State
State Highway Agency

About this bridge

LA3070 over Bayou Jonas is a concrete slab carrying LA3070 over Bayou Jonas in Acadia Parish, Louisiana. It was built in 1980, so it is 45 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 956 vehicles a day, roughly 12% of them trucks, projected to reach 1,051 by 2041. The structure is 38 ft (11.6 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesLA3070
CrossesBayou Jonas
Location1.73 MI North of LA 100
RouteState Highway 3070
CountyAcadia Parish
StateLouisiana
Coordinates30.26118, -92.4305
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionMay 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating32.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic956 (2021)
Projected traffic1,051 by 2041
Trucks12%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA3070 over Bayou Jonas built?

It was built in 1980, making it 45 years old in 2025.

What condition is LA3070 over Bayou Jonas 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 2023.

How much traffic does LA3070 over Bayou Jonas carry?

About 956 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is LA3070 over Bayou Jonas?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns LA3070 over Bayou Jonas?

It is owned by the State Highway Agency.