US Bridges

Bert Allen RD over Drainage Bayou

FairPosted for load

Ascension Parish, Louisiana · 0.4 M N of LA 621 · Structure no. 610330165905471

Built
1969
56 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete
Length
38 ft
2 main spans
Daily traffic
100
2019 count
Owner
County
County Highway Agency

About this bridge

Bert Allen RD over Drainage Bayou is a concrete slab carrying Bert Allen RD over Drainage Bayou in Ascension Parish, Louisiana. It was built in 1969, so it is 56 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. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, projected to reach 110 by 2039. The structure is 38 ft (11.6 m) long and 28 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesBert Allen RD
CrossesDrainage Bayou
Location0.4 M N of LA 621
RouteCounty Highway 0
Coordinates30.27561, -90.91282
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.4 US tons
Inventory rating16.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span19 ft (5.8 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2019)
Projected traffic110 by 2039
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

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 Bert Allen RD over Drainage Bayou built?

It was built in 1969, making it 56 years old in 2025.

What condition is Bert Allen RD over Drainage Bayou 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 February 2023.

How much traffic does Bert Allen RD over Drainage Bayou carry?

About 100 vehicles per day (2019 count).

How long is Bert Allen RD over Drainage Bayou?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 28 ft wide.

Who owns Bert Allen RD over Drainage Bayou?

It is owned by the County Highway Agency.