US Bridges

LA3105 over Benoit Bayou

Fair

Bossier Parish, Louisiana · 0.9 Mi. N. of I-220 · Structure no. 040808080705191

Built
2005
20 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete
Length
100 ft
5 main spans
Daily traffic
32,603
2021 count
Owner
State
State Highway Agency

About this bridge

LA3105 over Benoit Bayou is a concrete slab carrying LA3105 over Benoit Bayou in Bossier Parish, Louisiana. It was built in 2005, so it is 20 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 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 32,603 vehicles a day, roughly 10% of them trucks, projected to reach 35,863 by 2041. The structure is 100 ft (30.5 m) long and 80 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesLA3105
CrossesBenoit Bayou
Location0.9 Mi. N. of I-220
RouteState Highway 310
CountyBossier Parish
StateLouisiana
Coordinates32.56145, -93.7111
Functional classUrban Minor Arterial

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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating38.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span20 ft (6.1 m)
Deck width80 ft (24.4 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,603 (2021)
Projected traffic35,863 by 2041
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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 LA3105 over Benoit Bayou built?

It was built in 2005, making it 20 years old in 2025.

What condition is LA3105 over Benoit 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 November 2023.

How much traffic does LA3105 over Benoit Bayou carry?

About 32,603 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is LA3105 over Benoit Bayou?

The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.1 m) and a deck 80 ft wide.

Who owns LA3105 over Benoit Bayou?

It is owned by the State Highway Agency.