US Bridges

Hiram ST over Yarbor Bayou

Good

St. Landry Parish, Louisiana · 0.39 MI E of LA 357 · Structure no. 034900000030441

Built
2011
14 years old
Condition
Good
inspected January 2023
Type
Slab
Concrete
Length
40 ft
2 main spans
Daily traffic
150
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hiram ST over Yarbor Bayou is a concrete slab carrying Hiram ST over Yarbor Bayou in St. Landry Parish, Louisiana. It was built in 2011, so it is 14 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 150 vehicles a day, projected to reach 165 by 2040. The structure is 40 ft (12.2 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHiram ST
CrossesYarbor Bayou
Location0.39 MI E of LA 357
RouteCounty Highway 0
CountySt. Landry Parish
StateLouisiana
Coordinates30.5269, -92.09457
Functional classUrban 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 protection8 Very GoodNo problems noted.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating48.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span20 ft (6.1 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2020)
Projected traffic165 by 2040
Trucks—
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Hiram ST over Yarbor Bayou built?

It was built in 2011, making it 14 years old in 2025.

What condition is Hiram ST over Yarbor 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 January 2023.

How much traffic does Hiram ST over Yarbor Bayou carry?

About 150 vehicles per day (2020 count).

How long is Hiram ST over Yarbor Bayou?

The structure is 40 ft (12.2 m) long with a longest span of 20 ft (6.1 m) and a deck 27 ft wide.

Who owns Hiram ST over Yarbor Bayou?

It is owned by the City or Municipal Highway Agency.