US Bridges

LA0020 over Drainage Canal

Good

Terrebonne Parish, Louisiana · 9.3 MI E of LA 182 · Structure no. 025502440109431

Built
1984
41 years old
Condition
Good
inspected January 2024
Type
Slab
Concrete
Length
60 ft
3 main spans
Daily traffic
3,696
2021 count
Owner
State
State Highway Agency

About this bridge

LA0020 over Drainage Canal is a concrete slab carrying LA0020 over Drainage Canal in Terrebonne Parish, Louisiana. It was built in 1984, so it is 41 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 3,696 vehicles a day, roughly 20% of them trucks, projected to reach 4,065 by 2041. The structure is 60 ft (18.3 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesLA0020
CrossesDrainage Canal
Location9.3 MI E of LA 182
RouteState Highway 20
Coordinates29.72909, -90.8557
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating38.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span20 ft (6.1 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,696 (2021)
Projected traffic4,065 by 2041
Trucks20%
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 LA0020 over Drainage Canal built?

It was built in 1984, making it 41 years old in 2025.

What condition is LA0020 over Drainage Canal 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 2024.

How much traffic does LA0020 over Drainage Canal carry?

About 3,696 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is LA0020 over Drainage Canal?

The structure is 60 ft (18.3 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns LA0020 over Drainage Canal?

It is owned by the State Highway Agency.