US Bridges

LA3105 over Drain

Good

Bossier Parish, Louisiana · 1.4M North of I-20 · Structure no. 040808080703871

Built
1992
33 years old
Condition
Good
inspected November 2024
Type
Culvert
Concrete
Length
37 ft
5 main spans
Daily traffic
32,603
2021 count
Owner
State
State Highway Agency

About this bridge

LA3105 over Drain is a concrete culvert carrying LA3105 over Drain in Bossier Parish, Louisiana. It was built in 1992, so it is 33 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 32,603 vehicles a day, roughly 8% of them trucks, projected to reach 35,863 by 2041. The structure is 37 ft (11.3 m) long and 124 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLA3105
CrossesDrain
Location1.4M North of I-20
RouteState Highway 3105
Coordinates32.5429, -93.7085
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans5
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span7 ft (2.1 m)
Deck width124 ft (37.8 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,603 (2021)
Projected traffic35,863 by 2041
Trucks8%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 LA3105 over Drain built?

It was built in 1992, making it 33 years old in 2025.

What condition is LA3105 over Drain 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 November 2024.

How much traffic does LA3105 over Drain carry?

About 32,603 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is LA3105 over Drain?

The structure is 37 ft (11.3 m) long with a longest span of 7 ft (2.1 m) and a deck 124 ft wide.

Who owns LA3105 over Drain?

It is owned by the State Highway Agency.