US Bridges

Larock Road over Natalbany Creek

PoorPosted for load

Tangipahoa Parish, Louisiana · 0.9 MI W of US 51 · Structure no. 625330411903141

Built
1950
75 years old
Condition
Poor
inspected August 2024
Type
Truss - Thru
Steel
Length
122 ft
1 main span
Daily traffic
14
2022 count
Owner
County
County Highway Agency

About this bridge

Larock Road over Natalbany Creek is a steel truss - thru carrying Larock Road over Natalbany Creek in Tangipahoa Parish, Louisiana. It was built in 1950, so it is 75 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 14 vehicles a day, projected to reach 15 by 2042. The structure is 122 ft (37.2 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesLarock Road
CrossesNatalbany Creek
Location0.9 MI W of US 51
RouteCounty Highway 0
CountyTangipahoa Parish
StateLouisiana
Coordinates30.68566, -90.52394
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating12.5 US tons
Inventory rating9.6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 15
Structure length122 ft (37.2 m)
Longest span122 ft (37.2 m)
Deck width16 ft (5 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deck12 ft (3.7 m)

Traffic and service

Average daily traffic14 (2022)
Projected traffic15 by 2042
Trucks—
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$414,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Larock Road over Natalbany Creek built?

It was built in 1950, making it 75 years old in 2025.

What condition is Larock Road over Natalbany Creek 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 August 2024.

How much traffic does Larock Road over Natalbany Creek carry?

About 14 vehicles per day (2022 count).

How long is Larock Road over Natalbany Creek?

The structure is 122 ft (37.2 m) long with a longest span of 122 ft (37.2 m) and a deck 16 ft wide.

Who owns Larock Road over Natalbany Creek?

It is owned by the County Highway Agency.