US Bridges

N. Cswy Appr S.B. over Chinchuba Bayou

Good

St. Tammany Parish, Louisiana · 1.0 MI N Causeway N Appr. · Structure no. 625230223900602

Built
1954
71 years old
Condition
Good
inspected October 2024
Type
Tee Beam
Concrete
Length
126 ft
3 main spans
Daily traffic
16,000
1995 count
Owner
Toll Authority
Local Toll Authority

About this bridge

N. Cswy Appr S.B. over Chinchuba Bayou is a concrete tee beam carrying N. Cswy Appr S.B. over Chinchuba Bayou in St. Tammany Parish, Louisiana. It was built in 1954, so it is 71 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 16,000 vehicles a day, projected to reach 17,600 by 2015. The structure is 126 ft (38.4 m) long and 58 ft wide. If it were closed, the detour would be 60.3 mi (97 km).

Location

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CarriesN. Cswy Appr S.B.
CrossesChinchuba Bayou
Location1.0 MI N Causeway N Appr.
RouteCity Street 0
CountySt. Tammany Parish
StateLouisiana
Coordinates30.37989, -90.09129
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating33.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length126 ft (38.4 m)
Longest span42 ft (12.8 m)
Deck width58 ft (17.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,000 (1995)
Projected traffic17,600 by 2015
Trucks—
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.3 mi (97 km)
TollOn a toll road
National Highway SystemNo

Ownership and planned work

OwnerLocal Toll Authority
Maintained byLocal Toll Authority
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N. Cswy Appr S.B. over Chinchuba Bayou built?

It was built in 1954, making it 71 years old in 2025.

What condition is N. Cswy Appr S.B. over Chinchuba Bayou in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does N. Cswy Appr S.B. over Chinchuba Bayou carry?

About 16,000 vehicles per day (1995 count).

How long is N. Cswy Appr S.B. over Chinchuba Bayou?

The structure is 126 ft (38.4 m) long with a longest span of 42 ft (12.8 m) and a deck 58 ft wide.

Who owns N. Cswy Appr S.B. over Chinchuba Bayou?

It is owned by the Local Toll Authority.