US Bridges

Daw RD over Siphorien Bayou

Fair

De Soto Parish, Louisiana · 1.8 Mi. North of LA 509 · Structure no. 041632062933821

Built
2007
18 years old
Condition
Fair
inspected October 2024
Type
Culvert
Steel
Length
33 ft
3 main spans
Daily traffic
200
2021 count
Owner
County
County Highway Agency

About this bridge

Daw RD over Siphorien Bayou is a steel culvert carrying Daw RD over Siphorien Bayou in De Soto Parish, Louisiana. It was built in 2007, so it is 18 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 5 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 200 vehicles a day, projected to reach 220 by 2041. The structure is 33 ft (10.1 m) long and 679 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesDaw RD
CrossesSiphorien Bayou
Location1.8 Mi. North of LA 509
RouteCounty Highway 0
CountyDe Soto Parish
StateLouisiana
Coordinates32.10454, -93.63632
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
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating82.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span9 ft (2.7 m)
Deck width679 ft (207 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2021)
Projected traffic220 by 2041
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Daw RD over Siphorien Bayou built?

It was built in 2007, making it 18 years old in 2025.

What condition is Daw RD over Siphorien 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 October 2024.

How much traffic does Daw RD over Siphorien Bayou carry?

About 200 vehicles per day (2021 count).

How long is Daw RD over Siphorien Bayou?

The structure is 33 ft (10.1 m) long with a longest span of 9 ft (2.7 m) and a deck 679 ft wide.

Who owns Daw RD over Siphorien Bayou?

It is owned by the County Highway Agency.