320TH ST over STREAM


+42.05278, -91.55000
42°03'10" N, 91°32'60" 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 2016

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]
Operating rating:9.9 tons [9.0 metric tons]
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

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
May 201630.9PoorFairSeriousSeriousSD50
June 201530.9PoorFairSeriousSeriousSD50
May 201431.9PoorSatisfactorySeriousSeriousSD50
May 201331.9PoorSatisfactorySeriousSeriousSD50
May 201231.9PoorSatisfactorySeriousSeriousSD50
June 201131.9PoorSatisfactorySeriousSeriousSD50
May 201031.9PoorSatisfactorySeriousSeriousSD50
May 200931.9PoorSatisfactorySeriousSeriousSD45
April 200831.9PoorSatisfactorySeriousSeriousSD45
June 200731.9PoorGoodPoorSeriousSD45
March 200631.9PoorGoodPoorSeriousSD45
April 200437.4PoorGoodFairPoorSD45
August 200346.6PoorGoodFairPoorSD45
October 200146.6PoorGoodFairPoorSD45
December 199946.6PoorGoodFairPoorSD45
June 199846.2PoorGoodFairPoorSD45
May 199646.2PoorGoodFairPoorSD45
April 199463.5FairGoodSatisfactoryGoodFO30
June 199263.5FairGoodSatisfactoryGoodFO30
June 199063.5GoodGoodGoodGoodFO30