US Bridges

Potato Shed Road over Portage Bayou

Good

St. Martin Parish, Louisiana · 0.3 MI E. of LA 678 · Structure no. 035000000030009

Built
2019
6 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete
Length
120 ft
6 main spans
Daily traffic
612
2020 count
Owner
County
County Highway Agency

About this bridge

Potato Shed Road over Portage Bayou is a concrete slab carrying Potato Shed Road over Portage Bayou in St. Martin Parish, Louisiana. It was built in 2019, so it is 6 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 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 612 vehicles a day, projected to reach 673 by 2040. The structure is 120 ft (36.6 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesPotato Shed Road
CrossesPortage Bayou
Location0.3 MI E. of LA 678
RouteCounty Highway 0
CountySt. Martin Parish
StateLouisiana
Coordinates30.34301, -91.79614
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.2 US tons
Inventory rating36.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans6
Design loadHL 93
Structure length120 ft (36.6 m)
Longest span20 ft (6.1 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic612 (2020)
Projected traffic673 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Potato Shed Road over Portage Bayou built?

It was built in 2019, making it 6 years old in 2025.

What condition is Potato Shed Road over Portage 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 Potato Shed Road over Portage Bayou carry?

About 612 vehicles per day (2020 count).

How long is Potato Shed Road over Portage Bayou?

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

Who owns Potato Shed Road over Portage Bayou?

It is owned by the County Highway Agency.