US Bridges

LA0022 over Black River

Fair

St. Tammany Parish, Louisiana · LA 22 · Structure no. 625202610503601

Built
1935
90 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
45 ft
5 main spans
Daily traffic
9,784
2021 count
Owner
State
State Highway Agency

About this bridge

LA0022 over Black River is a concrete culvert carrying LA0022 over Black River in St. Tammany Parish, Louisiana. It was built in 1935, so it is 90 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 6 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 9,784 vehicles a day, roughly 8% of them trucks, projected to reach 10,762 by 2041. The structure is 45 ft (13.7 m) long and 45 ft wide.

CarriesLA0022
CrossesBlack River
LocationLA 22
RouteState Highway 22
Coordinates30.42378, -90.1871
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.7 US tons
Inventory rating19 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans5
Design loadH 15
Structure length45 ft (13.7 m)
Longest span8 ft (2.4 m)
Deck width45 ft (13.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,784 (2021)
Projected traffic10,762 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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$261,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0022 over Black River built?

It was built in 1935, making it 90 years old in 2025.

What condition is LA0022 over Black River 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 September 2023.

How much traffic does LA0022 over Black River carry?

About 9,784 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is LA0022 over Black River?

The structure is 45 ft (13.7 m) long with a longest span of 8 ft (2.4 m) and a deck 45 ft wide.

Who owns LA0022 over Black River?

It is owned by the State Highway Agency.