US Bridges

LA0059 over Chinchuba Branch

Fair

St. Tammany Parish, Louisiana · 1.6 M N of I-12 · Structure no. 625202810305521

Built
1972
53 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete
Length
76 ft
4 main spans
Daily traffic
14,110
2021 count
Owner
State
State Highway Agency

About this bridge

LA0059 over Chinchuba Branch is a concrete slab carrying LA0059 over Chinchuba Branch in St. Tammany 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 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 14,110 vehicles a day, roughly 8% of them trucks, projected to reach 15,521 by 2041. The structure is 76 ft (23.2 m) long and 31 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesLA0059
CrossesChinchuba Branch
Location1.6 M N of I-12
RouteState Highway 59
CountySt. Tammany Parish
StateLouisiana
Coordinates30.43889, -90.0415
Functional classUrban 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating42 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,110 (2021)
Projected traffic15,521 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$393,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0059 over Chinchuba Branch built?

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

What condition is LA0059 over Chinchuba Branch 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 October 2023.

How much traffic does LA0059 over Chinchuba Branch carry?

About 14,110 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is LA0059 over Chinchuba Branch?

The structure is 76 ft (23.2 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns LA0059 over Chinchuba Branch?

It is owned by the State Highway Agency.