US 20 over MISS. RIVER, HWY & RR


+42.49177, -90.66253
42°29'30" N, 90°39'45" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:US 20 over MISS. RIVER, HWY & RR
Structure number:000000000023880
Purpose:Carries highway and pedestrian walkway over highway, waterway, and railroad
Route classification:Other Principal Arterial (Urban) [14]
Length of largest span:845.2 ft. [257.6 m]
Total length:5760.1 ft. [1755.6 m]
Roadway width between curbs:27.9 ft. [8.5 m]
Deck width edge-to-edge:30.5 ft. [9.3 m]
Vertical clearance above deck:18.0 ft. [5.5 m]
Vertical clearance below bridge:45.9 ft. [14.0 m]
Owner:State Highway Agency [01]
Year built:1943
Year reconstructed:1992
Historic significance:Bridge is on the National Register of Historic Places [1]
Design load:MS 18 / HS 20 [5]
Number of main spans:3
Main spans material:Steel continuous [4]
Main spans design:Arch - Thru [12]
Deck type:Concrete Cast-in-Place [1]

Latest Available Inspection: October 2017

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:18,400 [as of 2017]
Truck traffic:7% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Satisfactory [6 out of 9]
Structural appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck geometry appraisal:Meets minimum tolerable limits to be left in place as is [4]
Underclearances appraisal:Basically intolerable requiring high priority of corrrective action [3]
Water adequacy appraisal:Superior to present desirable criteria [9]
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]
Pier/abutment protection:In place and functioning [2]
Scour condition:Countermeasures have been installed to mitigate an existing problem with scour. [7]
Sufficiency rating:46.3

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
October 2017FairGoodFairSatisfactory1840046.3
October 2015FairGoodFairSatisfactory1770046.3
October 2013FairGoodFairSatisfactory1770046.3
October 2011FairGoodFairSatisfactory1880046.3
October 2009FairGoodFairSatisfactory1890043.1
October 2007FairGoodFairSatisfactory1980043.4
October 2005FairGoodFairSatisfactory2680043.4
October 2003FairGoodFairSatisfactory2650043.4
January 1997FairGoodFairSatisfactory68800.0
December 1993FairGoodFairSatisfactory1820033.9
July 1992FairSatisfactorySatisfactorySatisfactory1960043.9
August 1988PoorPoorPoorPoor1890015.9

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
Steel Girder/Beamlinear ft.10,58210,582000
Steel Protective Coatingsq. ft.137,845137,845000
Steel Stringerlinear ft.20,99220,992000
Steel Protective Coatingsq. ft.117,604117,604000
Reinforced Concrete Decksq. ft.172,694172,694000
Steel Trusslinear ft.3,0783,078000
Steel Protective Coatingsq. ft.185,419185,419000
Steel Floor Beamlinear ft.7,6487,648000
Steel Protective Coatingsq. ft.53,53653,536000
Steel Gusset Plateeach160160000
Steel Protective Coatingsq. ft.15,36015,360000
Reinforced Concrete Columneach8585000
Reinforced Concrete Abutmentlinear ft.8383000
Reinforced Concrete Pier Caplinear ft.1,1851,185000
Strip Seal Jointlinear ft.643643000
Assembly without Seal Jointlinear ft.2828000
Movable Bearingeach8989000
Fixed Bearingeach3535000
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.8,1928,192000
Steel Protective Coatingsq. ft.819819000
Reinforced Concrete Bridge Raillinear ft.11,27011,270000