320TH ST over STREAM

This bridge is no longer in the current National Bridge Inventory database, and has likely been demolished or abandoned.


+41.62736, -91.32586
41°37'38" N, 91°19'33" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:320TH ST over STREAM
Structure number:000000000102270
Purpose:Carries highway over waterway
Route classification:Local (Rural) [09]
Length of largest span:49.9 ft. [15.2 m]
Total length:53.2 ft. [16.2 m]
Roadway width between curbs:17.7 ft. [5.4 m]
Deck width edge-to-edge:18.0 ft. [5.5 m]
Owner:County Highway Agency [02]
Year built:1932
Year reconstructed:1955
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Main span material:Steel [3]
Main span design:Truss - Thru [10]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Monolithic Concrete (concurrently placed with structural deck) [1]

Latest Available Inspection: May 2017

Good/Fair/Poor Condition:Poor
Status:Posted for load [P]
Average daily traffic:50 [as of 2010]
Deck condition:Fair [5 out of 9]
Superstructure condition:Serious [3 out of 9]
Substructure condition:Serious [3 out of 9]
Structural appraisal:Basically intolerable requiring high priority of replacement [2]
Deck geometry appraisal:Basically intolerable requiring high priority of corrrective action [3]
Water adequacy appraisal:Equal to present minimum criteria [6]
Roadway alignment appraisal:Better than present minimum criteria [7]
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:30.9
Recommended work:Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
May 2017PoorFairSeriousSerious5030.9
May 2016PoorFairSeriousSerious5030.9
June 2015PoorFairSeriousSerious5030.9
May 2014PoorSatisfactorySeriousSerious5031.9
May 2013PoorSatisfactorySeriousSerious5031.9
May 2012PoorSatisfactorySeriousSerious5031.9
June 2011PoorSatisfactorySeriousSerious5031.9
May 2010PoorSatisfactorySeriousSerious5031.9
May 2009PoorSatisfactorySeriousSerious4531.9
April 2008PoorSatisfactorySeriousSerious4531.9
June 2007PoorGoodPoorSerious4531.9
March 2006PoorGoodPoorSerious4531.9
April 2004PoorGoodFairPoor4537.4
August 2003PoorGoodFairPoor4546.6
October 2001PoorGoodFairPoor4546.6
December 1999PoorGoodFairPoor4546.6
June 1998PoorGoodFairPoor4546.2
May 1996PoorGoodFairPoor4546.2
April 1994FairGoodSatisfactoryGood3063.5
June 1992FairGoodSatisfactoryGood3063.5
June 1990GoodGoodGoodGood3063.5