US Bridges

Gravolet RD over Drainage Canal

PoorClosed to traffic

Plaquemines Parish, Louisiana · 0.01 Mi. W. of Hwy. 39 · Structure no. 023829363894991

Built
1968
57 years old
Condition
Poor
inspected January 2024
Type
Slab
Concrete
Length
76 ft
4 main spans
Daily traffic
150
1994 count
Owner
County
County Highway Agency

About this bridge

Gravolet RD over Drainage Canal is a concrete slab carrying Gravolet RD over Drainage Canal in Plaquemines Parish, Louisiana. It was built in 1968, so it is 57 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: closed to all traffic.

It carries about 150 vehicles a day, projected to reach 165 by 2014. The structure is 76 ft (23.2 m) long and 29 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesGravolet RD
CrossesDrainage Canal
Location0.01 Mi. W. of Hwy. 39
RouteCounty Highway 0
CountyPlaquemines Parish
StateLouisiana
Coordinates29.60675, -89.83235
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 12 months
Operating statusClosed to all traffic
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating25.7 US tons
Inventory rating18.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span19 ft (5.8 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (1994)
Projected traffic165 by 2014
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Gravolet RD over Drainage Canal built?

It was built in 1968, making it 57 years old in 2025.

What condition is Gravolet RD over Drainage Canal in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2024.

How much traffic does Gravolet RD over Drainage Canal carry?

About 150 vehicles per day (1994 count).

How long is Gravolet RD over Drainage Canal?

The structure is 76 ft (23.2 m) long with a longest span of 19 ft (5.8 m) and a deck 29 ft wide.

Who owns Gravolet RD over Drainage Canal?

It is owned by the County Highway Agency.