475th Avenue over Big Sioux River


+44.16703, -96.70969
44°10'01" N, 96°42'35" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:475th Avenue over Big Sioux River
Structure number:000000051090019
Location:1.1N & 12W of Ward
Purpose:Carries highway over waterway
Route classification:Local (Rural) [09]
Length of largest span:80.1 ft. [24.4 m]
Total length:212.0 ft. [64.6 m]
Roadway width between curbs:30.2 ft. [9.2 m]
Deck width edge-to-edge:32.5 ft. [9.9 m]
Owner:County Highway Agency [02]
Year built:1966
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Number of main spans:3
Main spans material:Steel [3]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Monolithic Concrete (concurrently placed with structural deck) [1]

Latest Available Inspection: July 2016

Good/Fair/Poor Condition:Fair
Status:Posted for load [P]
Average daily traffic:67 [as of 2014]
Truck traffic:2% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Satisfactory [6 out of 9]
Substructure condition:Fair [5 out of 9]
Structural appraisal:Basically intolerable requiring high priority of replacement [2]
Deck geometry appraisal:Better than present minimum criteria [7]
Water adequacy appraisal:Better than present minimum criteria [7]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:Bank protection is in need of minor repairs. River control devices and embankment protection have a little minor damage. Banks and/or channel have minor amounts of drift. [7]
Pier/abutment protection:Navigation protection not required [1]
Scour condition:Bridge with "unknown" foundation that has not been evaluated for scour. [U]
Operating rating:13.9 tons [12.6 metric tons]
Inventory rating:10.7 tons [9.7 metric tons]
Sufficiency rating:50.7
Recommended work:Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Estimated cost of work:$1,711,000

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
July 201650.7FairSatisfactorySatisfactoryFairSD67
July 201498.6FairFairSatisfactorySatisfactory-67
October 201291.1FairFairSatisfactorySatisfactory-67
October 201094.1FairFairSatisfactorySatisfactory-67
August 200894.1FairFairSatisfactorySatisfactory-67
June 200694.1FairFairSatisfactorySatisfactory-67
July 200494.1FairFairSatisfactorySatisfactory-67
August 200292.1FairFairSatisfactorySatisfactory-67
June 200092.1FairFairSatisfactorySatisfactory-67
September 199892.1FairGoodVery GoodSatisfactory-67
August 199692.1FairGoodVery GoodSatisfactory-67
May 199491.8FairGoodVery GoodSatisfactory-67
August 199290.7FairGoodVery GoodSatisfactory-67
August 199078.2GoodVery GoodVery GoodGood-67