US Bridges

Marthaville RD over Harpoon Bayou

Good

Sabine Parish, Louisiana · Marthaville Road · Structure no. 084331388932721

Built
1999
26 years old
Condition
Good
inspected January 2023
Type
Slab
Concrete
Length
79 ft
4 main spans
Daily traffic
350
2022 count
Owner
County
County Highway Agency

About this bridge

Marthaville RD over Harpoon Bayou is a concrete slab carrying Marthaville RD over Harpoon Bayou in Sabine Parish, Louisiana. It was built in 1999, so it is 26 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 350 vehicles a day, projected to reach 385 by 2042. The structure is 79 ft (24.1 m) long and 27 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesMarthaville RD
CrossesHarpoon Bayou
LocationMarthaville Road
RouteCounty Highway 0
CountySabine Parish
StateLouisiana
Coordinates31.64701, -93.4529
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.3 US tons
Inventory rating34 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length79 ft (24.1 m)
Longest span20 ft (6.1 m)
Deck width27 ft (8.2 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2022)
Projected traffic385 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Marthaville RD over Harpoon Bayou built?

It was built in 1999, making it 26 years old in 2025.

What condition is Marthaville RD over Harpoon 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 Marthaville RD over Harpoon Bayou carry?

About 350 vehicles per day (2022 count).

How long is Marthaville RD over Harpoon Bayou?

The structure is 79 ft (24.1 m) long with a longest span of 20 ft (6.1 m) and a deck 27 ft wide.

Who owns Marthaville RD over Harpoon Bayou?

It is owned by the County Highway Agency.