+30.34391, -90.98319
30°20'38" 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
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 2015 

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 desirable criteria [8]
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]
Operating rating:36.6 tons [33.3 metric tons]
Inventory rating:21.8 tons [19.8 metric tons]
Evaluation:Structurally deficient [1]
Sufficiency rating:34.2
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 

DateSuff. ratingEvaluationDeckSuper.Sub.ADT
August 201534.2Structurally deficientFairPoorSatisfactory12600
June 201334.3Structurally deficientFairPoorSatisfactory12200
February 201134.3Structurally deficientFairPoorSatisfactory12100
February 200934.6Structurally deficientFairPoorSatisfactory11300
January 200846.3Functionally obsoleteFairFairGood10500
January 200746.6Functionally obsoleteFairFairGood9300
January 200646.6Functionally obsoleteFairFairGood9000
January 200558.1Functionally obsoleteSatisfactoryGoodGood8700
January 200458.1Functionally obsoleteSatisfactoryGoodGood8600
January 200358.1Functionally obsoleteSatisfactoryGoodGood8300
January 200258.4Functionally obsoleteSatisfactoryGoodGood6560
January 200158.4Functionally obsoleteSatisfactoryGoodGood6560
January 200058.4Functionally obsoleteSatisfactoryGoodGood6560
January 199946.6Structurally deficientSatisfactoryGoodGood6560
January 199847.6Structurally deficientSatisfactoryGoodGood6676
January 199747.7Structurally deficientSatisfactoryGoodGood6529
January 199647.7Structurally deficientSatisfactoryGoodGood7771
January 199550.2Functionally obsoleteSatisfactoryGoodGood4847
January 199450.3Functionally obsoleteSatisfactoryGoodGood4686
January 199350.3Functionally obsoleteSatisfactoryGoodGood4331
January 199250.3Functionally obsoleteSatisfactoryGoodGood4331