US Bridges

LA0121 over Calcasieu River

PoorPosted for load

Rapides Parish, Louisiana · 0.76 Mi. SW of LA 461 · Structure no. 084000290503851

Built
1973
52 years old
Condition
Poor
inspected November 2024
Type
Slab
Concrete
Length
419 ft
22 main spans
Daily traffic
1,932
2021 count
Owner
State
State Highway Agency

About this bridge

LA0121 over Calcasieu River is a concrete slab carrying LA0121 over Calcasieu River in Rapides Parish, Louisiana. It was built in 1973, so it is 52 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 1,932 vehicles a day, roughly 14% of them trucks, projected to reach 2,125 by 2041. The structure is 419 ft (127.7 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLA0121
CrossesCalcasieu River
Location0.76 Mi. SW of LA 461
RouteState Highway 121
Coordinates31.12673, -92.7667
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans22
Design loadHS 20
Structure length419 ft (127.7 m)
Longest span19 ft (5.8 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,932 (2021)
Projected traffic2,125 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.8 million
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0121 over Calcasieu River built?

It was built in 1973, making it 52 years old in 2025.

What condition is LA0121 over Calcasieu River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does LA0121 over Calcasieu River carry?

About 1,932 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA0121 over Calcasieu River?

The structure is 419 ft (127.7 m) long with a longest span of 19 ft (5.8 m) and a deck 30 ft wide.

Who owns LA0121 over Calcasieu River?

It is owned by the State Highway Agency.