I 90 over RR


+46.55693, -112.87491
46°33'25" N, 112°52'30" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:I 90 over RR
Structure number:I00090170+00052
Location:4.3M W GARRISON
Purpose:Carries highway over railroad
Route classification:Principal Arterial - Interstate (Rural) [01]
Length of largest span:91.9 ft. [28.0 m]
Total length:264.8 ft. [80.7 m]
Roadway width between curbs:41.7 ft. [12.7 m]
Deck width edge-to-edge:44.9 ft. [13.7 m]
Vertical clearance below bridge:23.0 ft. [7.0 m]
Skew angle:45°
Owner:State Highway Agency [01]
Year built:1973
Year reconstructed:2002
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:3
Main spans material:Prestressed concrete [5]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Epoxy Overlay [5]

Latest Available Inspection: October 2017

Good/Fair/Poor Condition:Poor
Status:Open, no restriction [A]
Average daily traffic:4,510 [as of 2016]
Truck traffic:19% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Poor [4 out of 9]
Structural appraisal:Meets minimum tolerable limits to be left in place as is [4]
Deck geometry appraisal:Better than present minimum criteria [7]
Underclearances appraisal:Better than present minimum criteria [7]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Scour condition:Bridge not over waterway. [N]
Sufficiency rating:70.7

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
October 2017PoorGoodGoodPoor451070.7
October 2015FairSatisfactoryGoodFair836086.1
October 2013PoorFairGoodPoor836069.4
November 2011PoorFairGoodPoor836069.4
October 2009PoorFairGoodPoor844068.4
October 2007FairGoodGoodFair903086.5
January 2007FairGoodGoodFair882086.5
January 2003FairSatisfactoryVery GoodGood719097.7
August 2001FairSatisfactoryVery GoodGood719097.7
August 1997FairSatisfactoryVery GoodGood772097.6
October 1993FairSatisfactoryVery GoodGood722097.5
August 1991GoodGoodVery GoodGood723097.5

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
Prestressed Concrete Girder/Beamlinear ft.1,5911,591000
Reinforced Concrete Decksq. ft.11,8668,9562,91000
Wearing Surfacessq. ft.11,86611,866000
Concrete Protective Coatingsq. ft.11,86611,866000
Reinforced Concrete Columneach86200
Reinforced Concrete Pier Walllinear ft.1151021120
Reinforced Concrete Abutmentlinear ft.14810531120
Reinforced Concrete Pier Caplinear ft.1281141130
Fixed Bearingeach3603060
Steel Protective Coatingsq. ft.3627009
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.531531000