I-90 over SR 21


+47.09686, -118.66759
47°05'49" N, 118°40'03" W
Source: National Bridge Inventory
Information not verified. Use at your own risk.


Name:I-90 over SR 21
Structure number:0009185D0000000
Location:15.5 E GRANT CO
Purpose:Carries highway over highway
Route classification:Principal Arterial - Interstate (Rural) [01]
Length of largest span:62.0 ft. [18.9 m]
Total length:170.9 ft. [52.1 m]
Roadway width between curbs:38.1 ft. [11.6 m]
Deck width edge-to-edge:40.4 ft. [12.3 m]
Vertical clearance below bridge:17.1 ft. [5.2 m]
Owner:State Highway Agency [01]
Year built:1972
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18+Mod / HS 20+Mod [6]
Number of main spans:3
Main spans material:Prestressed concrete continuous [6]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Latex Concrete or similar additive [3]

Latest Available Inspection: July 2016 

Status:Open, no restriction [A]
Average daily traffic:4,811 [as of 2012]
Truck traffic:23% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Better than present minimum criteria [7]
Deck geometry appraisal:Equal to present minimum criteria [6]
Underclearances appraisal:Superior to present desirable criteria [9]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Scour condition:Bridge not over waterway. [N]
Operating rating:73.3 tons [66.6 metric tons]
Inventory rating:43.6 tons [39.6 metric tons]
Sufficiency rating:97.6

Previous Inspections 

DateSuff. ratingEvaluationDeckSuper.Sub.ADT
July 201697.6Not deficientSatisfactoryGoodGood4811
July 201497.6Not deficientGoodGoodGood4811
July 201297.5Not deficientGoodGoodGood4963
August 201097.6Not deficientGoodGoodGood4829
September 200696.6Not deficientGoodGoodGood4162
July 200297.6Not deficientGoodGoodGood4162
April 200097.6Not deficientGoodGoodGood4081
October 199897.6Not deficientGoodGoodGood4081
April 199697.4Not deficientGoodGoodGood4081
September 199497.4Not deficientGoodGoodGood4081
June 199297.8Not deficientGoodGoodGood3150