US Bridges

LA0531 over I-20

PoorPosted for load

Webster Parish, Louisiana · LA 531 over I-20 · Structure no. 046001110203321

Built
1960
65 years old
Condition
Poor
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
302 ft
2 main spans
Daily traffic
1,689
2021 count
Owner
State
State Highway Agency

About this bridge

LA0531 over I-20 is a steel stringer/multi-beam or girder carrying LA0531 over I-20 in Webster Parish, Louisiana. It was built in 1960, so it is 65 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 1,689 vehicles a day, roughly 10% of them trucks, projected to reach 1,857 by 2041. The structure is 302 ft (92 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesLA0531
CrossesI-20
LocationLA 531 over I-20
RouteState Highway 531
Coordinates32.58008, -93.248
Functional classUrban Minor Arterial

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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionJanuary 2025
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19.6 US tons
Inventory rating15 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+4 approach)
Design loadHS 20
Structure length302 ft (92 m)
Longest span75 ft (22.9 m)
Deck width29 ft (8.9 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,689 (2021)
Projected traffic1,857 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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$1.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was LA0531 over I-20 built?

It was built in 1960, making it 65 years old in 2025.

What condition is LA0531 over I-20 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 January 2025.

How much traffic does LA0531 over I-20 carry?

About 1,689 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is LA0531 over I-20?

The structure is 302 ft (92 m) long with a longest span of 75 ft (22.9 m) and a deck 29 ft wide.

Who owns LA0531 over I-20?

It is owned by the State Highway Agency.