I-405 (HWY 061) over CONN'S 1 & 2


+45.50456, -122.67441
45°30'16" N, 122°40'28" W
Source: National Bridge Inventory
Information not verified. Use at your own risk.


Name:I-405 (HWY 061) over CONN'S 1 & 2
Structure number:08591F061 00048
Purpose:Carries highway over highway
Route classification:Principal Arterial - Interstate (Urban) [11]
Length of largest span:186.0 ft. [56.7 m]
Total length:1140.1 ft. [347.5 m]
Roadway width between curbs:32.2 ft. [9.8 m]
Deck width edge-to-edge:37.1 ft. [11.3 m]
Vertical clearance above deck:18.7 ft. [5.7 m]
Vertical clearance below bridge:16.4 ft. [5.0 m]
Owner:State Highway Agency [01]
Year built:1966
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:Steel [3]
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: July 2015 

Status:Open, no restriction [A]
Average daily traffic:87,100 [as of 2014]
Truck traffic:5% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Satisfactory [6 out of 9]
Substructure condition:Satisfactory [6 out of 9]
Structural appraisal:Basically intolerable requiring high priority of corrrective action [3]
Deck geometry appraisal:Meets minimum tolerable limits to be left in place as is [4]
Underclearances appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Scour condition:Bridge not over waterway. [N]
Operating rating:21.0 tons [19.1 metric tons]
Inventory rating:16.4 tons [14.9 metric tons]
Evaluation:Functionally obsolete [2]
Sufficiency rating:54.4
Recommended work:Widening of existing bridge or other major structure without deck rehabilitation or replacement [33]
Estimated cost of work:$7,031,000

Previous Inspections 

DateSuff. ratingEvaluationDeckSuper.Sub.ADT
July 201554.4Functionally obsoleteSatisfactorySatisfactorySatisfactory87100
July 201358.2Functionally obsoleteSatisfactorySatisfactorySatisfactory24623
June 201087.5Not deficientSatisfactorySatisfactorySatisfactory24623
January 201087.5Not deficientSatisfactorySatisfactorySatisfactory24623
May 200887.5Not deficientSatisfactorySatisfactorySatisfactory24623
May 200687.6Not deficientSatisfactorySatisfactorySatisfactory23669
May 200487.6Not deficientSatisfactorySatisfactorySatisfactory23669
March 200287.6Not deficientGoodGoodGood22980
March 200087.6Not deficientGoodGoodGood22750
March 199884.6Functionally obsoleteGoodGoodGood22750
March 199687.4Not deficientGoodGoodGood19430
March 199487.4Not deficientGoodGoodGood19430
March 199287.4Not deficientGoodGoodGood19430
March 199087.4Not deficientGoodGoodGood19400