309 ST over I029


+42.90998, -96.79460
42°54'36" N, 96°47'41" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:309 ST over I029
Structure number:000000064006120
Location:4 N SD 48 INTERCH
Purpose:Carries highway over highway
Route classification:Local (Rural) [09]
Length of largest span:69.9 ft. [21.3 m]
Total length:253.9 ft. [77.4 m]
Roadway width between curbs:24.0 ft. [7.3 m]
Deck width edge-to-edge:26.2 ft. [8.0 m]
Vertical clearance below bridge:16.4 ft. [5.0 m]
Owner:State Highway Agency [01]
Year built:1961
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:M 18 / H 20 [4]
Number of main spans:4
Main spans material:Steel continuous [4]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Epoxy Overlay [5]

Latest Available Inspection: November 2017

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:20 [as of 2016]
Truck traffic:2% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Satisfactory [6 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Equal to present minimum criteria [6]
Deck geometry appraisal:Equal to present minimum criteria [6]
Underclearances appraisal:Equal to present minimum criteria [6]
Roadway alignment appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Scour condition:Bridge not over waterway. [N]
Sufficiency rating:95.1

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
November 2017FairGoodSatisfactoryGood2095.1
November 2015FairGoodSatisfactoryGood2095.1
November 2013FairGoodSatisfactoryGood2095.1
November 2011FairGoodSatisfactoryGood2095.1
December 2009FairGoodSatisfactoryGood2095.1
October 2007FairGoodSatisfactoryGood2095.1
February 2006FairGoodSatisfactoryGood2095.1
April 2004FairGoodSatisfactoryGood2095.1
May 2002FairGoodSatisfactoryGood22089.6
March 2000FairGoodSatisfactoryGood22088.6
April 1998FairGoodFairSatisfactory22077.6
April 1996GoodVery GoodGoodGood22088.6
March 1994GoodVery GoodGoodGood22089.8
February 1992GoodVery GoodGoodGood22091.6

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
Steel Girder/Beamlinear ft.1,016540460160
Steel Protective Coatingsq. ft.10,0007,4002,5001000
Reinforced Concrete Decksq. ft.6,6896,685220
Wearing Surfacessq. ft.6,6896,10042410065
Reinforced Concrete Columneach64200
Reinforced Concrete Abutmentlinear ft.8580500
Reinforced Concrete Pier Caplinear ft.7974500
Strip Seal Jointlinear ft.5353000
Movable Bearingeach1616000
Steel Protective Coatingsq. ft.8080000
Fixed Bearingeach44000
Steel Protective Coatingsq. ft.2020000
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.508508000