US Bridges

LA0020 over Donner Canal

Fair

Terrebonne Parish, Louisiana · 2.2 MI East of LA 182 · Structure no. 025502440102151

Built
1984
41 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete
Length
135 ft
6 main spans
Daily traffic
2,471
2021 count
Owner
State
State Highway Agency

About this bridge

LA0020 over Donner Canal is a concrete slab carrying LA0020 over Donner 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 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 2,471 vehicles a day, roughly 20% of them trucks, projected to reach 2,718 by 2041. The structure is 135 ft (41.1 m) long and 43 ft wide. If it were closed, the detour would be 32.9 mi (53 km).

Location

Open in Google Maps
CarriesLA0020
CrossesDonner Canal
Location2.2 MI East of LA 182
RouteState Highway 20
CountyTerrebonne Parish
StateLouisiana
Coordinates29.69283, -90.96737
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating38.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length135 ft (41.1 m)
Longest span25 ft (7.6 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,471 (2021)
Projected traffic2,718 by 2041
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed32.9 mi (53 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 Donner Canal built?

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

What condition is LA0020 over Donner 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 January 2024.

How much traffic does LA0020 over Donner Canal carry?

About 2,471 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is LA0020 over Donner Canal?

The structure is 135 ft (41.1 m) long with a longest span of 25 ft (7.6 m) and a deck 43 ft wide.

Who owns LA0020 over Donner Canal?

It is owned by the State Highway Agency.