US Bridges

US0011 over Irish Bayou

Poor

Orleans Parish, Louisiana · 4.83 MI North of US 90 · Structure no. 023600180104831

Built
1978
47 years old
Condition
Poor
inspected November 2023
Type
Slab
Concrete
Length
340 ft
17 main spans
Daily traffic
3,912
2021 count
Owner
State
State Highway Agency

About this bridge

US0011 over Irish Bayou is a concrete slab carrying US0011 over Irish Bayou in Orleans Parish, Louisiana. It was built in 1978, so it is 47 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 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 3,912 vehicles a day, roughly 20% of them trucks, projected to reach 4,303 by 2041. The structure is 340 ft (103.6 m) long and 43 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS0011
CrossesIrish Bayou
Location4.83 MI North of US 90
RouteU.S. Route 11
CountyOrleans Parish
StateLouisiana
Coordinates30.1412, -89.86404
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating34.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans17
Design loadHS 20
Structure length340 ft (103.6 m)
Longest span20 ft (6.1 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,912 (2021)
Projected traffic4,303 by 2041
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US0011 over Irish Bayou built?

It was built in 1978, making it 47 years old in 2025.

What condition is US0011 over Irish Bayou 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 2023.

How much traffic does US0011 over Irish Bayou carry?

About 3,912 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is US0011 over Irish Bayou?

The structure is 340 ft (103.6 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns US0011 over Irish Bayou?

It is owned by the State Highway Agency.