US Bridges

Koran Doyline RD over Clarke Bayou

Good

Bossier Parish, Louisiana · 0.8 MI North of LA 527 · Structure no. 040800000040414

Built
2016
9 years old
Condition
Good
inspected December 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
320 ft
8 main spans
Daily traffic
775
2020 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Koran Doyline RD over Clarke Bayou is a prestressed concrete box beam or girders - multiple carrying Koran Doyline RD over Clarke Bayou in Bossier Parish, Louisiana. It was built in 2016, so it is 9 years old, younger than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 775 vehicles a day, projected to reach 852 by 2040. The structure is 320 ft (97.5 m) long and 31 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesKoran Doyline RD
CrossesClarke Bayou
Location0.8 MI North of LA 527
RouteCounty Highway 0
CountyBossier Parish
StateLouisiana
Coordinates32.4385, -93.44545
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.7 US tons
Inventory rating46.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHL 93
Structure length320 ft (97.5 m)
Longest span40 ft (12.2 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic775 (2020)
Projected traffic852 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Koran Doyline RD over Clarke Bayou built?

It was built in 2016, making it 9 years old in 2025.

What condition is Koran Doyline RD over Clarke Bayou in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2024.

How much traffic does Koran Doyline RD over Clarke Bayou carry?

About 775 vehicles per day (2020 count).

How long is Koran Doyline RD over Clarke Bayou?

The structure is 320 ft (97.5 m) long with a longest span of 40 ft (12.2 m) and a deck 31 ft wide.

Who owns Koran Doyline RD over Clarke Bayou?

It is owned by the Town or Township Highway Agency.