US Bridges

Olson Drive over Outfall Canal

Fair

Plaquemines Parish, Louisiana · 1 KM S of Back Gate · Structure no. 1LA0108

Built
2003
22 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete
Length
95 ft
5 main spans
Daily traffic
1,000
2015 count
Owner
Federal
Navy / Marines

About this bridge

Olson Drive over Outfall Canal is a concrete slab carrying Olson Drive over Outfall Canal in Plaquemines Parish, Louisiana. It was built in 2003, so it is 22 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 1,000 vehicles a day, roughly 10% of them trucks, projected to reach 1,100 by 2037. The structure is 95 ft (29 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesOlson Drive
CrossesOutfall Canal
Location1 KM S of Back Gate
CountyPlaquemines Parish
StateLouisiana
Coordinates29.84758, -90.00933
Functional classUrban Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.8 US tons
Inventory rating53.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans5
Design loadHS 20
Structure length95 ft (29 m)
Longest span19 ft (5.8 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2015)
Projected traffic1,100 by 2037
Trucks10%
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

OwnerNavy / Marines
Maintained byNavy / Marines
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$13,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Olson Drive over Outfall Canal built?

It was built in 2003, making it 22 years old in 2025.

What condition is Olson Drive over Outfall 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 March 2023.

How much traffic does Olson Drive over Outfall Canal carry?

About 1,000 vehicles per day (2015 count), of which roughly 10% are trucks.

How long is Olson Drive over Outfall Canal?

The structure is 95 ft (29 m) long with a longest span of 19 ft (5.8 m) and a deck 43 ft wide.

Who owns Olson Drive over Outfall Canal?

It is owned by the Navy / Marines.