US Bridges

N. Wllie RD over Drainage Ditch

Poor

St. Tammany Parish, Louisiana · 2.2 M North of LA 1077 · Structure no. 625230364901311

Built
1990
35 years old
Condition
Poor
inspected November 2024
Type
Culvert
Steel
Length
41 ft
4 main spans
Daily traffic
2,255
2022 count
Owner
County
County Highway Agency

About this bridge

N. Wllie RD over Drainage Ditch is a steel culvert carrying N. Wllie RD over Drainage Ditch in St. Tammany Parish, Louisiana. It was built in 1990, so it is 35 years old, younger 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 4 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.

It carries about 2,255 vehicles a day, projected to reach 2,480 by 2042. The structure is 41 ft (12.5 m) long and 80 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesN. Wllie RD
CrossesDrainage Ditch
Location2.2 M North of LA 1077
RouteCounty Highway 0
CountySt. Tammany Parish
StateLouisiana
Coordinates30.60753, -90.21955
Functional classRural Local

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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2024
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 alignment7: Better than present minimum criteria
Operating rating107.1 US tons
Inventory rating82.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans4
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span8 ft (2.4 m)
Deck width80 ft (24.4 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,255 (2022)
Projected traffic2,480 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-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 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 N. Wllie RD over Drainage Ditch built?

It was built in 1990, making it 35 years old in 2025.

What condition is N. Wllie RD over Drainage Ditch 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 November 2024.

How much traffic does N. Wllie RD over Drainage Ditch carry?

About 2,255 vehicles per day (2022 count).

How long is N. Wllie RD over Drainage Ditch?

The structure is 41 ft (12.5 m) long with a longest span of 8 ft (2.4 m) and a deck 80 ft wide.

Who owns N. Wllie RD over Drainage Ditch?

It is owned by the County Highway Agency.