US Bridges

18th ST at Desiard over Drainage Canal

Good

Ouachita Parish, Louisiana · 0.7 MI NW of I-20 · Structure no. 053732307920621

Built
1996
29 years old
Condition
Good
inspected August 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
100,000
1979 count
Owner
City
City or Municipal Highway Agency

About this bridge

18th ST at Desiard over Drainage Canal is a concrete culvert carrying 18th ST at Desiard over Drainage Canal in Ouachita Parish, Louisiana. It was built in 1996, so it is 29 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 100,000 vehicles a day, projected to reach 110,000 by 1999. The structure is 21 ft (6.4 m) long and 180 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Carries18th ST at Desiard
CrossesDrainage Canal
Location0.7 MI NW of I-20
RouteCity Street 0
Coordinates32.51103, -92.10282
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2024
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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width180 ft (54.9 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100,000 (1979)
Projected traffic110,000 by 1999
Trucks—
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 18th ST at Desiard over Drainage Canal built?

It was built in 1996, making it 29 years old in 2025.

What condition is 18th ST at Desiard 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 August 2024.

How much traffic does 18th ST at Desiard over Drainage Canal carry?

About 100,000 vehicles per day (1979 count).

How long is 18th ST at Desiard over Drainage Canal?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 180 ft wide.

Who owns 18th ST at Desiard over Drainage Canal?

It is owned by the City or Municipal Highway Agency.