US Bridges

LA0031 over Daigre Canal

Fair

St. Martin Parish, Louisiana · 1.5 MI N of LA 86 · Structure no. 035000560201381

Built
1950
75 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete
Length
140 ft
7 main spans
Daily traffic
4,367
2021 count
Owner
State
State Highway Agency

About this bridge

LA0031 over Daigre Canal is a concrete tee beam carrying LA0031 over Daigre Canal in St. Martin Parish, Louisiana. It was built in 1950, so it is 75 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 4,367 vehicles a day, roughly 13% of them trucks, projected to reach 4,803 by 2041. The structure is 140 ft (42.7 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLA0031
CrossesDaigre Canal
Location1.5 MI N of LA 86
RouteState Highway 31
CountySt. Martin Parish
StateLouisiana
Coordinates30.06398, -91.82763
Functional classRural Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadH 15
Structure length140 ft (42.7 m)
Longest span20 ft (6.1 m)
Deck width29 ft (8.9 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,367 (2021)
Projected traffic4,803 by 2041
Trucks13%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$670,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0031 over Daigre Canal built?

It was built in 1950, making it 75 years old in 2025.

What condition is LA0031 over Daigre Canal 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 November 2023.

How much traffic does LA0031 over Daigre Canal carry?

About 4,367 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA0031 over Daigre Canal?

The structure is 140 ft (42.7 m) long with a longest span of 20 ft (6.1 m) and a deck 29 ft wide.

Who owns LA0031 over Daigre Canal?

It is owned by the State Highway Agency.