+42.32651, -91.93839
42°19'35" N, 91°56'18" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:320TH ST over DRAINAGE
Structure number:000000000081450
Purpose:Carries highway over waterway
Route classification:Local (Rural) [09]
Length of largest span:65.9 ft. [20.1 m]
Total length:67.9 ft. [20.7 m]
Roadway width between curbs:17.1 ft. [5.2 m]
Deck width edge-to-edge:19.0 ft. [5.8 m]
Owner:County Highway Agency [02]
Year built:2005
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18 / HS 20 [5]
Main span material:Steel [3]
Main span design:Other [00]
Deck type:Steel plate (includes orthotropic) [5]
Wearing surface:Gravel [8]

Latest Available Inspection: January 2018

Good/Fair/Poor Condition:Fair
Status:Posted for other load-capacity restriction [R]
Average daily traffic:30 [as of 2013]
Deck condition:Good [7 out of 9]
Superstructure condition:Satisfactory [6 out of 9]
Substructure condition:Satisfactory [6 out of 9]
Structural appraisal:Equal to present minimum criteria [6]
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:85.5

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
January 2018FairGoodSatisfactorySatisfactory3085.5
January 2016FairGoodSatisfactorySatisfactory3090.5
February 2014GoodGoodGoodGood3090.5
January 2012GoodVery GoodVery GoodVery Good3086.5
January 2010GoodVery GoodVery GoodVery Good3086.5
January 2008GoodVery GoodVery GoodVery Good3086.5
January 2006GoodExcellentExcellentExcellent3088.5
December 2003PoorFairSeriousSerious3022.1
March 2002PoorSatisfactorySeriousPoor3023.1
May 2001PoorSatisfactorySeriousPoor3023.1
January 2000PoorSatisfactorySeriousPoor3023.1
March 1999PoorSatisfactorySeriousPoor3023.1
March 1997PoorSatisfactorySeriousPoor1523.2
January 1996PoorSatisfactoryPoorPoor1523.3
October 1993PoorSatisfactoryPoorPoor1523.3
October 1992PoorSatisfactoryPoorPoor1523.3
October 1991PoorSatisfactoryPoorPoor1523.3