US Bridges

Botany Bay RD over Bayou Portage

FairPosted for load

St. Landry Parish, Louisiana · 1.1 MI E of Seven Arpent · Structure no. 034930280915361

Built
1975
50 years old, rebuilt 2013
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
38 ft
2 main spans
Daily traffic
150
2020 count
Owner
County
County Highway Agency

About this bridge

Botany Bay RD over Bayou Portage is a concrete slab carrying Botany Bay RD over Bayou Portage in St. Landry Parish, Louisiana. It was built in 1975 and reconstructed in 2013, so it is 50 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. Its operating status is: posted for load restriction.

It carries about 150 vehicles a day, projected to reach 165 by 2040. The structure is 38 ft (11.6 m) long and 26 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesBotany Bay RD
CrossesBayou Portage
Location1.1 MI E of Seven Arpent
RouteCounty Highway 0
CountySt. Landry Parish
StateLouisiana
Coordinates30.46689, -91.89325
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 alignment7: Better than present minimum criteria
Operating rating26.8 US tons
Inventory rating20.7 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 width26 ft (8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2020)
Projected traffic165 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Botany Bay RD over Bayou Portage built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 2013.

What condition is Botany Bay RD over Bayou Portage 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 April 2023.

How much traffic does Botany Bay RD over Bayou Portage carry?

About 150 vehicles per day (2020 count).

How long is Botany Bay RD over Bayou Portage?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 26 ft wide.

Who owns Botany Bay RD over Bayou Portage?

It is owned by the County Highway Agency.