6th Street over Big Sioux River


+43.55122, -96.72359
43°33'04" N, 96°43'25" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:6th Street over Big Sioux River
Structure number:000000050203205
Location:east of Phillips Avenue
Purpose:Carries highway over waterway
Route classification:Collector (Urban) [17]
Length of largest span:62.3 ft. [19.0 m]
Total length:231.3 ft. [70.5 m]
Roadway width between curbs:47.9 ft. [14.6 m]
Deck width edge-to-edge:63.3 ft. [19.3 m]
Skew angle:21°
Owner:City or Municipal Highway Agency [04]
Year built:1975
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:4
Main spans material:Concrete continuous [2]
Main spans design:Slab [01]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Low slump Concrete [4]

Latest Available Inspection: September 2016

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:7,850 [as of 2014]
Truck traffic:8% of total traffic
Deck condition:Fair [5 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck geometry appraisal:Basically intolerable requiring high priority of replacement [2]
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]
Pier/abutment protection:In place and functioning [2]
Scour condition:Bridge is scour critical; bridge foundations determined to be unstable. [3]
Sufficiency rating:61.0
Recommended work:Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Estimated cost of work:$1,894,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
September 2016FairFairFairGood785061.0
September 2014PoorPoorSatisfactoryGood785070.2
October 2012PoorPoorSatisfactoryGood785075.0
November 2010PoorPoorSatisfactoryGood785075.0
October 2008FairFairSatisfactoryGood785077.0
October 2006FairFairSatisfactoryGood785077.0
June 2004FairFairSatisfactoryGood785077.0
May 2002FairSatisfactorySatisfactoryGood785078.1
October 2000GoodGoodGoodGood785078.1
November 1998GoodGoodGoodGood785078.1
November 1996GoodVery GoodGoodVery Good785078.1
November 1994GoodVery GoodGoodVery Good785078.2
December 1992GoodVery GoodGoodVery Good785078.2
January 1990PoorPoorFairGood785055.1