+46.42839, -105.30839
46°25'42" N, 105°18'30" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:US 12 over POWDER RIVER
Structure number:P00002031+07241
Location:26M E MILES CITY
Purpose:Carries highway over waterway
Route classification:Minor Arterial (Rural) [06]
Length of largest span:125.0 ft. [38.1 m]
Total length:622.1 ft. [189.6 m]
Roadway width between curbs:37.4 ft. [11.4 m]
Deck width edge-to-edge:40.4 ft. [12.3 m]
Owner:State Highway Agency [01]
Year built:1973
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:5
Main spans material:Prestressed concrete [5]
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: April 2017

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:962 [as of 2016]
Truck traffic:9% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Satisfactory [6 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Equal to present minimum criteria [6]
Deck geometry appraisal:Better than present minimum criteria [7]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:Bank is beginning to slump. River control devices and embankment protection have widespread minor damage. There is minor stream bed movement evident. Debris is restricting the channel slightly. [6]
Scour condition:Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Sufficiency rating:83.0

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
April 2017FairGoodSatisfactoryGood96283.0
April 2015FairGoodSatisfactoryGood63089.1
April 2013FairGoodSatisfactoryGood63089.1
May 2011FairGoodFairGood63077.3
May 2008GoodGoodVery GoodGood57089.7
October 2006GoodVery GoodVery GoodGood66088.8
November 2004GoodVery GoodVery GoodGood62089.2
February 2003GoodVery GoodVery GoodGood48090.5
January 2001GoodVery GoodVery GoodGood47090.6
January 1999GoodVery GoodVery GoodGood53090.1
November 1996GoodVery GoodVery GoodGood46790.6
March 1995GoodVery GoodVery GoodVery Good46796.7
September 1992GoodVery GoodVery GoodVery Good39495.1
November 1990GoodVery GoodVery GoodVery Good42294.9

Element Data

Source: National Bridge Elements dataset, 2018 edition. This feature is experimental.
Prestressed Concrete Girder/Beamlinear ft.3,6913,691000
Reinforced Concrete Decksq. ft.24,98324,48350000
Reinforced Concrete Pier Walllinear ft.187187000
Reinforced Concrete Abutmentlinear ft.112112000
Reinforced Concrete Pier Caplinear ft.161153800
Open Jointlinear ft.3939000
Assembly without Seal Jointlinear ft.1211091200
Movable Bearingeach3028200
Steel Protective Coatingsq. ft.3029100
Fixed Bearingeach1817100
Steel Protective Coatingsq. ft.1818000
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.1,2341,11112300
Steel Protective Coatingsq. ft.1,2341,1726200