US Bridges

LA0066 over Bayou Sara (backwater)

Fair

West Feliciana Parish, Louisiana · 1.2 MI W of US61 · Structure no. 616302510101331

Built
1980
45 years old
Condition
Fair
inspected December 2024
Type
Slab
Concrete
Length
142 ft
7 main spans
Daily traffic
4,492
2021 count
Owner
State
State Highway Agency

About this bridge

LA0066 over Bayou Sara (backwater) is a concrete slab carrying LA0066 over Bayou Sara (backwater) in West Feliciana Parish, Louisiana. It was built in 1980, so it is 45 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.

It carries about 4,492 vehicles a day, roughly 10% of them trucks, projected to reach 4,941 by 2041. The structure is 142 ft (43.3 m) long and 43 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesLA0066
CrossesBayou Sara (backwater)
Location1.2 MI W of US61
RouteState Highway 66
CountyWest Feliciana Parish
StateLouisiana
Coordinates30.84379, -91.40158
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating79 US tons
Inventory rating47 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length142 ft (43.3 m)
Longest span20 ft (6.1 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,492 (2021)
Projected traffic4,941 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 LA0066 over Bayou Sara (backwater) built?

It was built in 1980, making it 45 years old in 2025.

What condition is LA0066 over Bayou Sara (backwater) 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 December 2024.

How much traffic does LA0066 over Bayou Sara (backwater) carry?

About 4,492 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is LA0066 over Bayou Sara (backwater)?

The structure is 142 ft (43.3 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns LA0066 over Bayou Sara (backwater)?

It is owned by the State Highway Agency.