+30.69434, -91.47210
30°41'40" N, 91°28'20" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:LA3131 over PORTAGE CANAL
Structure number:613908392401031
Purpose:Carries highway over waterway
Route classification:Minor Arterial (Urban) [16]
Length of largest span:20.0 ft. [6.1 m]
Total length:100.1 ft. [30.5 m]
Roadway width between curbs:40.0 ft. [12.2 m]
Deck width edge-to-edge:42.7 ft. [13.0 m]
Owner:State Highway Agency [01]
Year built:1970
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18 / HS 20 [5]
Number of main spans:5
Main spans material:Concrete [1]
Main spans design:Slab [01]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Monolithic Concrete (concurrently placed with structural deck) [1]

Latest Available Inspection: September 2018

Good/Fair/Poor Condition:Good
Status:Open, no restriction [A]
Average daily traffic:10,700 [as of 2016]
Truck traffic:7% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Better than present minimum criteria [7]
Deck geometry appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:Bank is beginning to slump. River control devices and embankment protection have widespread minor damage. There is minor stream bed movement evident. Debris is restricting the channel slightly. [6]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Sufficiency rating:89.9

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
September 2018GoodGoodGoodGood1070089.9
September 2016GoodGoodGoodGood1040090.0
September 2014GoodGoodGoodGood1010090.0
October 2012GoodGoodGoodGood960090.0
October 2010GoodGoodGoodGood870091.1
October 2008GoodGood-Good870091.1
October 2006FairSatisfactoryVery GoodVery Good870090.1
November 2004FairSatisfactoryVery GoodVery Good760090.2
November 2002FairSatisfactoryVery GoodVery Good820090.2
November 2000FairSatisfactoryVery GoodVery Good849790.1
November 1998FairSatisfactoryVery GoodVery Good1092089.9
November 1996FairSatisfactoryVery GoodVery Good736393.3
November 1994FairSatisfactoryVery GoodVery Good688793.4
November 1992FairSatisfactoryVery GoodVery Good601193.5
November 1990FairSatisfactoryVery GoodVery Good601193.5

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
Reinforced Concrete Abutmentlinear ft.104870170
Prestressed Concrete Pileeach2017030
Reinforced Concrete Pier Caplinear ft.176172400
Pourable Jointlinear ft.240000240
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.200200000
Reinforced Concrete Slabsq. ft.4,0003,850101400