US Bridges

LA 485 over Drain

Good

Natchitoches Parish, Louisiana · 8.77 MI North of LA 6 · Structure no. 083500000083501

Built
2024
1 years old
Condition
Good
inspected March 2024
Type
Culvert
Concrete
Length
42 ft
4 main spans
Daily traffic
700
2021 count
Owner
State
State Highway Agency

About this bridge

LA 485 over Drain is a concrete culvert carrying LA 485 over Drain in Natchitoches Parish, Louisiana. It was built in 2024, so it is 1 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 700 vehicles a day, roughly 12% of them trucks, projected to reach 770 by 2041. The structure is 42 ft (12.8 m) long and 85 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesLA 485
CrossesDrain
Location8.77 MI North of LA 6
RouteState Highway 485
Coordinates31.82153, -93.28745
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.8 US tons
Inventory rating44 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadGreater than HL 93
Structure length42 ft (12.8 m)
Longest span8 ft (2.4 m)
Deck width85 ft (25.8 m)
Roadway width0 ft (0 m)
Vertical clearance over deck0 ft (0 m)

Traffic and service

Average daily traffic700 (2021)
Projected traffic770 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was LA 485 over Drain built?

It was built in 2024, making it 1 years old in 2025.

What condition is LA 485 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 March 2024.

How much traffic does LA 485 over Drain carry?

About 700 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is LA 485 over Drain?

The structure is 42 ft (12.8 m) long with a longest span of 8 ft (2.4 m) and a deck 85 ft wide.

Who owns LA 485 over Drain?

It is owned by the State Highway Agency.