US Bridges

LA0485 over Bayou Pierre

Fair

Natchitoches Parish, Louisiana · 5.30 MI E of JCT 1-49 · Structure no. 083501150206081

Built
1978
47 years old
Condition
Fair
inspected May 2024
Type
Girder and Floorbeam System
Steel
Length
452 ft
1 main span
Daily traffic
462
2021 count
Owner
State
State Highway Agency

About this bridge

LA0485 over Bayou Pierre is a steel girder and floorbeam system carrying LA0485 over Bayou Pierre in Natchitoches Parish, Louisiana. It was built in 1978, so it is 47 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 5 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 462 vehicles a day, roughly 14% of them trucks, projected to reach 508 by 2041. The structure is 452 ft (137.8 m) long and 33 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesLA0485
CrossesBayou Pierre
Location5.30 MI E of JCT 1-49
RouteState Highway 485
CountyNatchitoches Parish
StateLouisiana
Coordinates31.86003, -93.2058
Functional classRural Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating38.9 US tons
Inventory rating30 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+7 approach)
Design loadHS 20
Structure length452 ft (137.8 m)
Longest span100 ft (30.5 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic462 (2021)
Projected traffic508 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 LA0485 over Bayou Pierre built?

It was built in 1978, making it 47 years old in 2025.

What condition is LA0485 over Bayou Pierre 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 May 2024.

How much traffic does LA0485 over Bayou Pierre carry?

About 462 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA0485 over Bayou Pierre?

The structure is 452 ft (137.8 m) long with a longest span of 100 ft (30.5 m) and a deck 33 ft wide.

Who owns LA0485 over Bayou Pierre?

It is owned by the State Highway Agency.