US Bridges

Thelma ST over 20 Arpent Canal

Good

St. Bernard Parish, Louisiana · 0.4 MI N of LA 39 · Structure no. 024400000000018

Built
2015
10 years old
Condition
Good
inspected March 2023
Type
Slab
Concrete
Length
65 ft
3 main spans
Daily traffic
195
2023 count
Owner
County
County Highway Agency

About this bridge

Thelma ST over 20 Arpent Canal is a concrete slab carrying Thelma ST over 20 Arpent Canal in St. Bernard Parish, Louisiana. It was built in 2015, so it is 10 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 195 vehicles a day, projected to reach 214 by 2043. The structure is 65 ft (19.8 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesThelma ST
Crosses20 Arpent Canal
Location0.4 MI N of LA 39
RouteCounty Highway 0
CountySt. Bernard Parish
StateLouisiana
Coordinates29.9431, -89.94877
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating37.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadGreater than HL 93
Structure length65 ft (19.8 m)
Longest span25 ft (7.6 m)
Deck width36 ft (10.9 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic195 (2023)
Projected traffic214 by 2043
Trucks—
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

OwnerCounty Highway Agency
Maintained byCounty 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 Thelma ST over 20 Arpent Canal built?

It was built in 2015, making it 10 years old in 2025.

What condition is Thelma ST over 20 Arpent Canal 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 March 2023.

How much traffic does Thelma ST over 20 Arpent Canal carry?

About 195 vehicles per day (2023 count).

How long is Thelma ST over 20 Arpent Canal?

The structure is 65 ft (19.8 m) long with a longest span of 25 ft (7.6 m) and a deck 36 ft wide.

Who owns Thelma ST over 20 Arpent Canal?

It is owned by the County Highway Agency.