+42.43698, -93.07318
42°26'13" N, 93°04'23" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:US 20 over IOWA RIVER
Structure number:000000000608350
Location:1.5 mi. W of Jct. SR S56
Purpose:Carries highway over waterway
Route classification:Principal Arterial - Other (Rural) [02]
Length of largest span:302.2 ft. [92.1 m]
Total length:1639.2 ft. [499.6 m]
Roadway width between curbs:78.7 ft. [24.0 m]
Deck width edge-to-edge:84.3 ft. [25.7 m]
Owner:State Highway Agency [01]
Year built:2003
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:Steel continuous [4]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Monolithic Concrete (concurrently placed with structural deck) [1]

Latest Available Inspection: August 2018

Good/Fair/Poor Condition:Good
Status:Open, no restriction [A]
Average daily traffic:8,600 [as of 2018]
Truck traffic:26% of total traffic
Deck condition:Very Good [8 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Very Good [8 out of 9]
Structural appraisal:Better than present minimum criteria [7]
Deck geometry appraisal:Superior to present desirable criteria [9]
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 the assessed or calculated scour condition. [8]
Sufficiency rating:93.7

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
August 2018GoodVery GoodGoodVery Good860093.7
August 2016GoodVery GoodGoodVery Good830098.8
August 2014GoodGoodGoodVery Good800098.9
August 2012GoodGoodGoodVery Good770098.9
August 2010GoodVery GoodGoodVery Good760098.9
August 2008GoodVery GoodGoodVery Good730099.0
August 2006GoodExcellentExcellentExcellent700099.0
January 2004GoodExcellentExcellentExcellent280081.0

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
Steel Girder/Beamlinear ft.12,09612,096000
Prestressed Concrete Girder/Beamlinear ft.1,4821,482000
Reinforced Concrete Decksq. ft.138,074138,073100
Wearing Surfacessq. ft.129,090129,090000
Reinforced Concrete Columneach88000
Reinforced Concrete Pier Walllinear ft.170170000
Concrete Protective Coatingsq. ft.976976000
Reinforced Concrete Abutmentlinear ft.170170000
Reinforced Concrete Pier Caplinear ft.344344000
Pourable Jointlinear ft.158158000
Assembly without Seal Jointlinear ft.168168000
Elastomeric Bearingeach2424000
Pot Bearingeach4848000
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.3,2803,280000
Steel Protective Coatingsq. ft.5,2745,274000
Reinforced Concrete Bridge Raillinear ft.6,5586,5180400