I 115S over SEP I 15


+46.00335, -112.56913
46°00'12" N, 112°34'09" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:I 115S over SEP I 15
Structure number:I00115000+02471
Location:0.6M W BUTTE
Purpose:Carries highway over highway
Route classification:Principal Arterial - Interstate (Rural) [01]
Length of largest span:61.0 ft. [18.6 m]
Total length:243.8 ft. [74.3 m]
Roadway width between curbs:27.9 ft. [8.5 m]
Deck width edge-to-edge:31.8 ft. [9.7 m]
Vertical clearance below bridge:16.4 ft. [5.0 m]
Owner:State Highway Agency [01]
Year built:1964
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:2
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: October 2016

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:1,365 [as of 2015]
Truck traffic:1% of total traffic
Deck condition:Fair [5 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Satisfactory [6 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 corrrective action [3]
Underclearances appraisal:Meets minimum tolerable limits to be left in place as is [4]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Scour condition:Bridge not over waterway. [N]
Sufficiency rating:72.2
Recommended work:Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Estimated cost of work:$690,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
October 2016FairFairFairSatisfactory136572.2
October 2014FairFairSatisfactorySatisfactory376075.3
October 2012FairFairSatisfactorySatisfactory376075.3
October 2010FairFairSatisfactorySatisfactory376075.3
February 2009FairFairSatisfactorySatisfactory390075.3
January 2007FairSatisfactorySatisfactorySatisfactory349076.4
December 2004FairSatisfactoryGoodGood367075.3
October 2002FairSatisfactoryGoodGood364076.3
March 2001FairSatisfactoryGoodGood364076.3
June 1995FairFairGoodGood368075.3
June 1993FairFairGoodGood342077.3
October 1990FairFairGoodGood289077.4

Element Data

Source: National Bridge Elements dataset, 2018 edition. This feature is experimental.
Steel Girder/Beamlinear ft.48923924550
Steel Protective Coatingsq. ft.4,1073,6970205205
Prestressed Concrete Girder/Beamlinear ft.4204071300
Reinforced Concrete Decksq. ft.7,7313,5766723,4830
Steel Pin or Pin & Hangar Assemblyeach80800
Steel Protective Coatingsq. ft.80080
Reinforced Concrete Columneach62400
Reinforced Concrete Abutmentlinear ft.8281100
Reinforced Concrete Pier Caplinear ft.5646820
Open Jointlinear ft.5905504
Movable Bearingeach1801800
Steel Protective Coatingsq. ft.1814004
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.49518031500
Steel Protective Coatingsq. ft.2,8212,18600635