S 21 over INT CONRAD I 15


+48.18132, -111.93544
48°10'53" N, 111°56'08" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:S 21 over INT CONRAD I 15
Structure number:P00021005+01641
Purpose:Carries highway overpass over highway
Route classification:Minor Arterial (Rural) [06]
Length of largest span:122.1 ft. [37.2 m]
Total length:371.1 ft. [113.1 m]
Roadway width between curbs:47.6 ft. [14.5 m]
Deck width edge-to-edge:50.2 ft. [15.3 m]
Vertical clearance below bridge:16.4 ft. [5.0 m]
Skew angle:28°
Owner:State Highway Agency [01]
Year built:1972
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Number of main spans:2
Main spans material:Steel continuous [4]
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: June 2017

Good/Fair/Poor Condition:Poor
Status:Open, no restriction [A]
Average daily traffic:1,968 [as of 2016]
Truck traffic:2% of total traffic
Deck condition:Poor [4 out of 9]
Superstructure condition:Satisfactory [6 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:Superior to present desirable criteria [9]
Underclearances appraisal:Better than present minimum criteria [7]
Roadway alignment appraisal:Better than present minimum criteria [7]
Scour condition:Bridge not over waterway. [N]
Sufficiency rating:84.8

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
June 2017PoorPoorSatisfactorySatisfactory196884.8
June 2015FairFairSatisfactorySatisfactory227099.0
July 2013FairFairSatisfactorySatisfactory227099.0
July 2011FairSatisfactorySatisfactorySatisfactory2270100.0
July 2009FairSatisfactorySatisfactorySatisfactory2190100.0
June 2007FairSatisfactorySatisfactorySatisfactory2430100.0
April 2005GoodGoodGoodGood2240100.0
April 2003GoodGoodGoodGood2120100.0
August 2001GoodGoodGoodGood212099.0
April 1999FairGoodGoodSatisfactory1530100.0
December 1996FairGoodSatisfactorySatisfactory2010100.0
November 1994FairGoodSatisfactorySatisfactory205098.0
February 1991GoodGoodGoodGood183098.0

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
Steel Girder/Beamlinear ft.2,2241,739461240
Steel Protective Coatingsq. ft.30,27821,1956,0551,5141,514
Reinforced Concrete Decksq. ft.18,81518,815000
Reinforced Concrete Columneach99000
Reinforced Concrete Abutmentlinear ft.154146800
Reinforced Concrete Pier Caplinear ft.171170010
Strip Seal Jointlinear ft.115115000
Movable Bearingeach24011130
Steel Protective Coatingsq. ft.2402022
Fixed Bearingeach1806120
Steel Protective Coatingsq. ft.1804311
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.742074200
Steel Protective Coatingsq. ft.1,2377433726161