US Bridges

LA0423 over Cypress Bayou

Fair

East Baton Rouge Parish, Louisiana · LA0423 · Structure no. 611708173100821

Built
1957
68 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
120 ft
6 main spans
Daily traffic
6,448
2021 count
Owner
State
State Highway Agency

About this bridge

LA0423 over Cypress Bayou is a concrete slab carrying LA0423 over Cypress Bayou in East Baton Rouge Parish, Louisiana. It was built in 1957, so it is 68 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 6,448 vehicles a day, roughly 7% of them trucks, projected to reach 7,092 by 2041. The structure is 120 ft (36.6 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLA0423
CrossesCypress Bayou
LocationLA0423
RouteState Highway 423
CountyEast Baton Rouge Parish
StateLouisiana
Coordinates30.55883, -91.16015
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.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.9 US tons
Inventory rating22.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length120 ft (36.6 m)
Longest span20 ft (6.1 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,448 (2021)
Projected traffic7,092 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$585,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0423 over Cypress Bayou built?

It was built in 1957, making it 68 years old in 2025.

What condition is LA0423 over Cypress 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 September 2023.

How much traffic does LA0423 over Cypress Bayou carry?

About 6,448 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is LA0423 over Cypress Bayou?

The structure is 120 ft (36.6 m) long with a longest span of 20 ft (6.1 m) and a deck 29 ft wide.

Who owns LA0423 over Cypress Bayou?

It is owned by the State Highway Agency.