US Bridges

LA0055 over Madison Canal

Fair

Terrebonne Parish, Louisiana · 8.8 MI South of LA 58 · Structure no. 025502480200001

Built
1970
55 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete
Length
180 ft
4 main spans
Daily traffic
276
2021 count
Owner
State
State Highway Agency

About this bridge

LA0055 over Madison Canal is a concrete slab carrying LA0055 over Madison Canal in Terrebonne Parish, Louisiana. It was built in 1970, so it is 55 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 276 vehicles a day, roughly 12% of them trucks, projected to reach 303 by 2041. The structure is 180 ft (54.9 m) long and 30 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesLA0055
CrossesMadison Canal
Location8.8 MI South of LA 58
RouteState Highway 55
CountyTerrebonne Parish
StateLouisiana
Coordinates29.38642, -90.58778
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating30 US tons
Inventory rating23.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic276 (2021)
Projected traffic303 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 LA0055 over Madison Canal built?

It was built in 1970, making it 55 years old in 2025.

What condition is LA0055 over Madison 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 May 2023.

How much traffic does LA0055 over Madison Canal carry?

About 276 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is LA0055 over Madison Canal?

The structure is 180 ft (54.9 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns LA0055 over Madison Canal?

It is owned by the State Highway Agency.