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]

Latest Available Inspection: October 2018

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:2,065 [as of 2017]
Truck traffic:2% of total traffic
Deck condition:Fair [5 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Fair [5 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:71.1
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 2018FairFairFairFair206571.1
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, 2019 edition. This feature is experimental.
Steel Girder/Beamlinear ft.473197256200
Steel Protective Coatingsq. ft.4,1072,4651,232205205
Prestressed Concrete Girder/Beamlinear ft.4204100100
Reinforced Concrete Decksq. ft.7,731007,7310
Steel Pin or Pin & Hangar Assemblyeach80800
Steel Protective Coatingsq. ft.80035
Reinforced Concrete Columneach62220
Reinforced Concrete Abutmentlinear ft.8279120
Reinforced Concrete Pier Caplinear ft.56183710
Compression Jointlinear ft.6000546
Assembly without Seal Jointlinear ft.56042140
Movable Bearingeach1601510
Steel Protective Coatingsq. ft.160484
Fixed Bearingeach20200
Steel Protective Coatingsq. ft.20002
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.490049000
Steel Protective Coatingsq. ft.2,8211,269423423706