US Bridges

LA0605 over Clark Bayou

Good

Tensas Parish, Louisiana · 4.8 MI East of US 65 · Structure no. 585408542304841

Built
1984
41 years old
Condition
Good
inspected August 2023
Type
Slab
Concrete
Length
190 ft
10 main spans
Daily traffic
499
2021 count
Owner
State
State Highway Agency

About this bridge

LA0605 over Clark Bayou is a concrete slab carrying LA0605 over Clark Bayou in Tensas Parish, Louisiana. It was built in 1984, so it is 41 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 499 vehicles a day, roughly 15% of them trucks, projected to reach 548 by 2041. The structure is 190 ft (57.9 m) long and 36 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesLA0605
CrossesClark Bayou
Location4.8 MI East of US 65
RouteState Highway 605
Coordinates32.05466, -91.2256
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans10
Design loadHS 20
Structure length190 ft (57.9 m)
Longest span19 ft (5.8 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic499 (2021)
Projected traffic548 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 LA0605 over Clark Bayou built?

It was built in 1984, making it 41 years old in 2025.

What condition is LA0605 over Clark 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 August 2023.

How much traffic does LA0605 over Clark Bayou carry?

About 499 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is LA0605 over Clark Bayou?

The structure is 190 ft (57.9 m) long with a longest span of 19 ft (5.8 m) and a deck 36 ft wide.

Who owns LA0605 over Clark Bayou?

It is owned by the State Highway Agency.