US Bridges

LA0021 over Tchefuncte River

Good

St. Tammany Parish, Louisiana · 1.85 Mi. N of I-12 · Structure no. 625200000620285

Built
2017
8 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
600 ft
15 main spans
Daily traffic
34,242
2021 count
Owner
State
State Highway Agency

About this bridge

LA0021 over Tchefuncte River is a prestressed concrete continuous stringer/multi-beam or girder carrying LA0021 over Tchefuncte River in St. Tammany Parish, Louisiana. It was built in 2017, so it is 8 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 34,242 vehicles a day, roughly 8% of them trucks, projected to reach 37,666 by 2041. The structure is 600 ft (182.9 m) long and 44 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesLA0021
CrossesTchefuncte River
Location1.85 Mi. N of I-12
RouteState Highway 21
CountySt. Tammany Parish
StateLouisiana
Coordinates30.46337, -90.11821
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.5 US tons
Inventory rating47.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans15
Design loadGreater than HL 93
Structure length600 ft (182.9 m)
Longest span40 ft (12.2 m)
Deck width44 ft (13.5 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,242 (2021)
Projected traffic37,666 by 2041
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 LA0021 over Tchefuncte River built?

It was built in 2017, making it 8 years old in 2025.

What condition is LA0021 over Tchefuncte River 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 September 2023.

How much traffic does LA0021 over Tchefuncte River carry?

About 34,242 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is LA0021 over Tchefuncte River?

The structure is 600 ft (182.9 m) long with a longest span of 40 ft (12.2 m) and a deck 44 ft wide.

Who owns LA0021 over Tchefuncte River?

It is owned by the State Highway Agency.