309 ST over I029


+42.90997, -96.79517
42°54'36" N, 96°47'43" 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:16.7 ft. [5.1 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 2015

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:20 [as of 2014]
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]
Operating rating:50.9 tons [46.3 metric tons]
Inventory rating:29.9 tons [27.2 metric tons]
Sufficiency rating:95.1

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
November 201595.1FairGoodSatisfactoryGood-20
November 201395.1FairGoodSatisfactoryGood-20
November 201195.1FairGoodSatisfactoryGood-20
December 200995.1FairGoodSatisfactoryGood-20
October 200795.1FairGoodSatisfactoryGood-20
February 200695.1FairGoodSatisfactoryGood-20
April 200495.1FairGoodSatisfactoryGood-20
May 200289.6FairGoodSatisfactoryGood-220
March 200088.6FairGoodSatisfactoryGood-220
April 199877.6FairGoodFairSatisfactory-220
April 199688.6GoodVery GoodGoodGood-220
March 199489.8GoodVery GoodGoodGood-220
February 199291.6GoodVery GoodGoodGood-220