US Bridges

LA0023/JOHN Riley over Drainage Canal

Fair

Plaquemines Parish, Louisiana · 48.3 MI South of LA 406 · Structure no. 023800620510334

Built
1976
49 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete
Length
80 ft
4 main spans
Daily traffic
526
2016 count
Owner
State
State Highway Agency

About this bridge

LA0023/JOHN Riley over Drainage Canal is a concrete slab carrying LA0023/JOHN Riley over Drainage Canal in Plaquemines Parish, Louisiana. It was built in 1976, so it is 49 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 5 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 526 vehicles a day, roughly 5% of them trucks, projected to reach 578 by 2036. The structure is 80 ft (24.4 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLA0023/JOHN Riley
CrossesDrainage Canal
Location48.3 MI South of LA 406
RouteState Highway 23
CountyPlaquemines Parish
StateLouisiana
Coordinates29.36973, -89.57991
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionMay 2023
Inspection intervalevery 24 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating79 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic526 (2016)
Projected traffic578 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 LA0023/JOHN Riley over Drainage Canal built?

It was built in 1976, making it 49 years old in 2025.

What condition is LA0023/JOHN Riley over Drainage 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 LA0023/JOHN Riley over Drainage Canal carry?

About 526 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is LA0023/JOHN Riley over Drainage Canal?

The structure is 80 ft (24.4 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns LA0023/JOHN Riley over Drainage Canal?

It is owned by the State Highway Agency.