+30.34353, -90.98300
30°20'37" N, 90°58'59" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:LA0073 over BAYOU MANCHAC
Structure number:611700770400001
Location:0.68 MI N OF LA 427
Purpose:Carries highway over waterway
Route classification:Minor Arterial (Urban) [16]
Length of largest span:82.0 ft. [25.0 m]
Total length:325.1 ft. [99.1 m]
Roadway width between curbs:24.0 ft. [7.3 m]
Deck width edge-to-edge:26.9 ft. [8.2 m]
Owner:State Highway Agency [01]
Year built:1931
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:M 13.5 / H 15 [2]
Number of main spans:5
Main spans material:Steel [3]
Main spans design:Truss - Thru [10]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Bituminous [6]

Latest Available Inspection: August 2017

Good/Fair/Poor Condition:Poor
Status:Posted for load [P]
Average daily traffic:12,600 [as of 2015]
Truck traffic:18% of total traffic
Deck condition:Fair [5 out of 9]
Superstructure condition:Poor [4 out of 9]
Substructure condition:Satisfactory [6 out of 9]
Structural appraisal:Meets minimum tolerable limits to be left in place as is [4]
Deck geometry appraisal:Basically intolerable requiring high priority of replacement [2]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present minimum criteria [6]
Channel protection:Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]
Scour condition:Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Sufficiency rating:34.6
Recommended work:Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Estimated cost of work:$1,384,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
August 2017PoorFairPoorSatisfactory1260034.6
August 2015PoorFairPoorSatisfactory1260034.2
June 2013PoorFairPoorSatisfactory1220034.3
February 2011PoorFairPoorSatisfactory1210034.3
February 2009PoorFairPoorSatisfactory1130034.6
January 2008FairFairFairGood1050046.3
January 2007FairFairFairGood930046.6
January 2006FairFairFairGood900046.6
January 2005FairSatisfactoryGoodGood870058.1
January 2004FairSatisfactoryGoodGood860058.1
January 2003FairSatisfactoryGoodGood830058.1
January 2002FairSatisfactoryGoodGood656058.4
January 2001FairSatisfactoryGoodGood656058.4
January 2000FairSatisfactoryGoodGood656058.4
January 1999FairSatisfactoryGoodGood656046.6
January 1998FairSatisfactoryGoodGood667647.6
January 1997FairSatisfactoryGoodGood652947.7
January 1996FairSatisfactoryGoodGood777147.7
January 1995FairSatisfactoryGoodGood484750.2
January 1994FairSatisfactoryGoodGood468650.3
January 1993FairSatisfactoryGoodGood433150.3
January 1992FairSatisfactoryGoodGood433150.3

Element Data

Source: National Bridge Elements dataset, 2018 edition. This feature is experimental.
Steel Girder/Beamlinear ft.480240218220
Steel Protective Coatingsq. ft.1,774665687222200
Steel Stringerlinear ft.1,245855783120
Steel Protective Coatingsq. ft.4,9892,49502,4940
Reinforced Concrete Decksq. ft.8,22501,2436,9820
Wearing Surfacessq. ft.1,00075025000
Steel Trusslinear ft.498004980
Steel Protective Coatingsq. ft.10010
Steel Floor Beamlinear ft.5462701391370
Steel Protective Coatingsq. ft.4,5952,8721,1495740
Steel Gusset Plateeach603315120
Steel Protective Coatingsq. ft.625625000
Reinforced Concrete Pier Walllinear ft.144131850
Reinforced Concrete Abutmentlinear ft.72031410
Pourable Jointlinear ft.4848000
Assembly without Seal Jointlinear ft.96484800
Movable Bearingeach60060
Steel Protective Coatingsq. ft.5700570
Fixed Bearingeach186480
Steel Protective Coatingsq. ft.2480160
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.658653050
Steel Protective Coatingsq. ft.3,2902,49080000