US Bridges

Allen Marthaville over Watson Bayou

Good

Natchitoches Parish, Louisiana · 1 M. NE of LA 120 · Structure no. 083531449932201

Built
1999
26 years old
Condition
Good
inspected January 2025
Type
Slab
Concrete
Length
57 ft
3 main spans
Daily traffic
82
2022 count
Owner
County
County Highway Agency

About this bridge

Allen Marthaville over Watson Bayou is a concrete slab carrying Allen Marthaville over Watson Bayou in Natchitoches 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 82 vehicles a day, projected to reach 90 by 2042. The structure is 57 ft (17.4 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesAllen Marthaville
CrossesWatson Bayou
Location1 M. NE of LA 120
RouteCounty Highway 0
CountyNatchitoches Parish
StateLouisiana
Coordinates31.74869, -93.3658
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38.3 US tons
Inventory rating29.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span19 ft (5.8 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic82 (2022)
Projected traffic90 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Allen Marthaville over Watson Bayou built?

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

What condition is Allen Marthaville over Watson 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 2025.

How much traffic does Allen Marthaville over Watson Bayou carry?

About 82 vehicles per day (2022 count).

How long is Allen Marthaville over Watson Bayou?

The structure is 57 ft (17.4 m) long with a longest span of 19 ft (5.8 m) and a deck 27 ft wide.

Who owns Allen Marthaville over Watson Bayou?

It is owned by the County Highway Agency.