US Bridges

4 Mile Bayou RD over Hog Bayou

Good

St. Martin Parish, Louisiana · 7.3 MI N. of LA 70 · Structure no. 035000000035008

Built
2023
2 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
38 ft
2 main spans
Daily traffic
422
2020 count
Owner
County
County Highway Agency

About this bridge

4 Mile Bayou RD over Hog Bayou is a wood or timber stringer/multi-beam or girder carrying 4 Mile Bayou RD over Hog Bayou in St. Martin Parish, Louisiana. It was built in 2023, so it is 2 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 422 vehicles a day, projected to reach 464 by 2040. The structure is 38 ft (11.6 m) long and 21 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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Carries4 Mile Bayou RD
CrossesHog Bayou
Location7.3 MI N. of LA 70
RouteCounty Highway 0
CountySt. Martin Parish
StateLouisiana
Coordinates29.83641, -91.13524
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.
Substructure8 Very GoodNo problems noted.
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length38 ft (11.6 m)
Longest span19 ft (5.8 m)
Deck width21 ft (6.3 m)
Roadway width19 ft (5.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic422 (2020)
Projected traffic464 by 2040
Trucks—
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 4 Mile Bayou RD over Hog Bayou built?

It was built in 2023, making it 2 years old in 2025.

What condition is 4 Mile Bayou RD over Hog 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 4 Mile Bayou RD over Hog Bayou carry?

About 422 vehicles per day (2020 count).

How long is 4 Mile Bayou RD over Hog Bayou?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 21 ft wide.

Who owns 4 Mile Bayou RD over Hog Bayou?

It is owned by the County Highway Agency.