US Bridges

Patty Jo LN over Black Bayou

Fair

Ascension Parish, Louisiana · 0.1 MI SE of Ascen. 929 · Structure no. 610330181905111

Built
1965
60 years old
Condition
Fair
inspected January 2023
Type
Culvert
Concrete
Length
23 ft
3 main spans
Daily traffic
20
2019 count
Owner
County
County Highway Agency

About this bridge

Patty Jo LN over Black Bayou is a concrete culvert carrying Patty Jo LN over Black Bayou in Ascension Parish, Louisiana. It was built in 1965, so it is 60 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 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 20 vehicles a day, projected to reach 22 by 2039. The structure is 23 ft (7 m) long and 25 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesPatty Jo LN
CrossesBlack Bayou
Location0.1 MI SE of Ascen. 929
RouteCounty Highway 0
CountyAscension Parish
StateLouisiana
Coordinates30.30446, -90.93714
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating43.2 US tons
Inventory rating33.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length23 ft (7 m)
Longest span8 ft (2.4 m)
Deck width25 ft (7.6 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2019)
Projected traffic22 by 2039
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Patty Jo LN over Black Bayou built?

It was built in 1965, making it 60 years old in 2025.

What condition is Patty Jo LN over Black 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 January 2023.

How much traffic does Patty Jo LN over Black Bayou carry?

About 20 vehicles per day (2019 count).

How long is Patty Jo LN over Black Bayou?

The structure is 23 ft (7 m) long with a longest span of 8 ft (2.4 m) and a deck 25 ft wide.

Who owns Patty Jo LN over Black Bayou?

It is owned by the County Highway Agency.