US Bridges

LA3039 over Bayou Portage

FairPosted for load

St. Martin Parish, Louisiana · 5.7 MI North of LA 347 · Structure no. 035008502805791

Built
1961
64 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
97 ft
5 main spans
Daily traffic
1,807
2021 count
Owner
State
State Highway Agency

About this bridge

LA3039 over Bayou Portage is a wood or timber stringer/multi-beam or girder carrying LA3039 over Bayou Portage in St. Martin Parish, Louisiana. It was built in 1961, so it is 64 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 1,807 vehicles a day, roughly 12% of them trucks, projected to reach 1,987 by 2041. The structure is 97 ft (29.6 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLA3039
CrossesBayou Portage
Location5.7 MI North of LA 347
RouteState Highway 3039
CountySt. Martin Parish
StateLouisiana
Coordinates30.28129, -91.82454
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.8 US tons
Inventory rating21.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans5
Design loadH 15
Structure length97 ft (29.6 m)
Longest span19 ft (5.8 m)
Deck width27 ft (8.1 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,807 (2021)
Projected traffic1,987 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 LA3039 over Bayou Portage built?

It was built in 1961, making it 64 years old in 2025.

What condition is LA3039 over Bayou Portage in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does LA3039 over Bayou Portage carry?

About 1,807 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is LA3039 over Bayou Portage?

The structure is 97 ft (29.6 m) long with a longest span of 19 ft (5.8 m) and a deck 27 ft wide.

Who owns LA3039 over Bayou Portage?

It is owned by the State Highway Agency.