I55 NB TO I20WB over I20 WB TO I55SB AND US51


+32.27350, -90.20906
32°16'25" N, 90°12'33" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:I55 NB TO I20WB over I20 WB TO I55SB AND US51
Structure number:170005502509120
Location:0.4 MI N MCDOWELL RD
Purpose:Carries highway over highway
Route classification:Principal Arterial - Interstate (Urban) [11]
Length of largest span:100.1 ft. [30.5 m]
Total length:432.1 ft. [131.7 m]
Roadway width between curbs:27.9 ft. [8.5 m]
Deck width edge-to-edge:32.8 ft. [10.0 m]
Vertical clearance below bridge:13.1 ft. [4.0 m]
Owner:State Highway Agency [01]
Year built:1966
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18+Mod / HS 20+Mod [6]
Number of main spans:4
Main spans material:Concrete continuous [2]
Main spans design:Box Beam or girders - Single or Spread [06]
Deck type:Concrete Cast-in-Place [1]

Latest Available Inspection: June 2018

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:8,100 [as of 2017]
Truck traffic:18% of total traffic
Deck condition:Fair [5 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Very Good [8 out of 9]
Structural appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck geometry appraisal:Superior to present desirable criteria [9]
Underclearances appraisal:Meets minimum tolerable limits to be left in place as is [4]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Scour condition:Bridge not over waterway. [N]
Sufficiency rating:77.0
Recommended work:Widening of existing bridge with deck rehabilitation or replacement. [34]
Estimated cost of work:$396,000,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
June 2018FairFairFairVery Good810077.0
June 2016FairFairFairVery Good770075.1
June 2014FairFairFairVery Good770061.4
July 2012FairFairFairVery Good770061.4
June 2010FairFairFairVery Good770061.4
June 2008GoodGoodVery GoodVery Good1100073.3
September 2006GoodGoodVery GoodVery Good1100074.3
October 2004GoodVery GoodVery GoodVery Good1000076.4
August 2002GoodVery GoodVery GoodVery Good1000076.4
October 2000GoodVery GoodVery GoodVery Good600076.6
August 1998GoodVery GoodVery GoodVery Good600076.6
April 1997GoodVery GoodVery GoodVery Good600077.0
January 1995GoodVery GoodVery GoodVery Good544079.0
June 1991GoodVery GoodVery GoodVery Good495079.0

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
Reinforced Concrete Closed Web/Box Girderlinear ft.432430020
Reinforced Concrete Top Flangesq. ft.14,176014,17600
Reinforced Concrete Columneach77000
Reinforced Concrete Abutmentlinear ft.120120000
Reinforced Concrete Pier Caplinear ft.4848000
Assembly with Sealeach5656000
Open Jointlinear ft.5656000
Elastomeric Bearingeach2020000
Movable Bearingeach1010000
Steel Protective Coatingsq. ft.1001000
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.864864000
Steel Protective Coatingsq. ft.864000864