US Bridges

Grand Ave over Cypress Bayou

Good

St. Tammany Parish, Louisiana · 1.65 Miles South of US90 · Structure no. 625200000107031

Built
2015
10 years old
Condition
Good
inspected December 2024
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
284
2017 count
Owner
County
County Highway Agency

About this bridge

Grand Ave over Cypress Bayou is a concrete culvert carrying Grand Ave over Cypress Bayou in St. Tammany Parish, Louisiana. It was built in 2015, so it is 10 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 284 vehicles a day, projected to reach 312 by 2037. The structure is 32 ft (9.8 m) long and 56 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesGrand Ave
CrossesCypress Bayou
Location1.65 Miles South of US90
RouteCounty Highway 0
Coordinates30.29447, -89.91813
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span9 ft (2.7 m)
Deck width56 ft (17 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic284 (2017)
Projected traffic312 by 2037
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Grand Ave over Cypress Bayou built?

It was built in 2015, making it 10 years old in 2025.

What condition is Grand Ave over Cypress 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 December 2024.

How much traffic does Grand Ave over Cypress Bayou carry?

About 284 vehicles per day (2017 count).

How long is Grand Ave over Cypress Bayou?

The structure is 32 ft (9.8 m) long with a longest span of 9 ft (2.7 m) and a deck 56 ft wide.

Who owns Grand Ave over Cypress Bayou?

It is owned by the County Highway Agency.