478th Avenue over Big Sioux River


+43.98734, -96.64927
43°59'14" N, 96°38'57" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:478th Avenue over Big Sioux River
Structure number:000000051120144
Location:1S of Egan
Purpose:Carries highway over waterway
Route classification:Major Collector (Rural) [07]
Length of largest span:89.9 ft. [27.4 m]
Total length:259.9 ft. [79.2 m]
Roadway width between curbs:32.2 ft. [9.8 m]
Deck width edge-to-edge:34.8 ft. [10.6 m]
Owner:County Highway Agency [02]
Year built:1994
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18+Mod / HS 20+Mod [6]
Number of main spans:3
Main spans material:Prestressed concrete continuous [6]
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: August 2016

Good/Fair/Poor Condition:Good
Status:Open, no restriction [A]
Average daily traffic:430 [as of 2014]
Truck traffic:3% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Very Good [8 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Better than present minimum criteria [7]
Deck geometry appraisal:Equal to present minimum criteria [6]
Water adequacy appraisal:Superior to present desirable criteria [9]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]
Pier/abutment protection:Navigation protection not required [1]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Operating rating:52.8 tons [48.0 metric tons]
Inventory rating:38.7 tons [35.2 metric tons]
Sufficiency rating:99.9

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
August 201699.9GoodGoodVery GoodGood-430
July 201499.9GoodGoodVery GoodGood-430
October 201299.9GoodGoodVery GoodGood-430
October 201099.9GoodGoodVery GoodGood-430
August 200899.9GoodGoodVery GoodGood-430
June 200699.9GoodGoodVery GoodGood-430
July 200499.9GoodGoodVery GoodGood-430
August 200299.9GoodGoodVery GoodGood-430
October 200099.9GoodGoodVery GoodGood-430
September 199899.9GoodGoodVery GoodGood-430
August 199699.9GoodGoodVery GoodVery Good-430
June 199499.9GoodGoodVery GoodVery Good-430
January 199499.9GoodExcellentExcellentExcellent-430
August 199254.7FairFairGoodSatisfactoryFO430
August 199049.1FairGoodGoodSatisfactoryFO430