US Bridges

LA0579 over Cooks Slough

PoorPosted for load

East Carroll Parish, Louisiana · 1.33 MI South of LA 577 · Structure no. 051808180903271

Built
1961
64 years old
Condition
Poor
inspected March 2023
Type
Slab
Concrete
Length
38 ft
2 main spans
Daily traffic
119
2021 count
Owner
State
State Highway Agency

About this bridge

LA0579 over Cooks Slough is a concrete slab carrying LA0579 over Cooks Slough in East Carroll Parish, Louisiana. It was built in 1961, so it is 64 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 119 vehicles a day, roughly 15% of them trucks, projected to reach 130 by 2041. The structure is 38 ft (11.6 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesLA0579
CrossesCooks Slough
Location1.33 MI South of LA 577
RouteState Highway 579
Coordinates32.57767, -91.3846
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating22.5 US tons
Inventory rating17.5 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 width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic119 (2021)
Projected traffic130 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 LA0579 over Cooks Slough built?

It was built in 1961, making it 64 years old in 2025.

What condition is LA0579 over Cooks Slough in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does LA0579 over Cooks Slough carry?

About 119 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is LA0579 over Cooks Slough?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 28 ft wide.

Who owns LA0579 over Cooks Slough?

It is owned by the State Highway Agency.