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HWY 120 over COLUMBIA SLOUGH

Map

Coordinates:
+45.60041, -122.71951
45°36'01" N, 122°43'10" W

Facts

Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:HWY 120 over COLUMBIA SLOUGH
Structure number:01726 120 00038
Location:5.5 MI NW PORTLAND CC
Purpose:Carries highway over waterway
Route classification:Minor Arterial (Urban) [16]
Length of largest span:85.0 ft. [25.9 m]
Total length:337.9 ft. [103.0 m]
Roadway width between curbs:24.0 ft. [7.3 m]
Deck width edge-to-edge:33.8 ft. [10.3 m]
Owner:State Highway Agency [01]
Year built:1933
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:M 13.5 / H 15 [2]
Main span material:Steel [3]
Main span design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Bituminous [6]

Latest Available Inspection: January 2017

Good/Fair/Poor Condition:Fair
Status:Posted for load [P]
Average daily traffic:31,400 [as of 2014]
Truck traffic:20% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Fair [5 out of 9]
Structural appraisal:Meets minimum tolerable limits to be left in place as is [4]
Deck geometry appraisal:Basically intolerable requiring high priority of replacement [2]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Operating rating:32.9 tons [29.9 metric tons]
Inventory rating:19.9 tons [18.1 metric tons]
Sufficiency rating:36.4
Recommended work:Widening of existing bridge or other major structure without deck rehabilitation or replacement [33]
Estimated cost of work:$1,732,000

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
January 201736.4FairSatisfactoryFairFairFO31400
January 201536.4FairSatisfactorySatisfactoryFairFO23900
January 201336.4FairSatisfactorySatisfactoryFairFO23900
December 201136.4FairSatisfactorySatisfactoryFairFO23900
July 200939.5FairSatisfactorySatisfactoryFairFO9900
July 200837.9FairSatisfactorySatisfactoryFairFO11211
July 20077.0PoorSatisfactorySatisfactorySeriousSD12400
November 200549.7FairSatisfactorySatisfactorySatisfactoryFO12400
November 200350.3FairSatisfactorySatisfactorySatisfactoryFO11500
December 200250.3FairSatisfactoryGoodGoodFO11500
November 200150.7GoodGoodGoodGoodFO11100
November 199950.7GoodGoodGoodGoodFO11100
November 199753.5GoodGoodVery GoodGoodFO10300
November 199547.4GoodGoodVery GoodGoodFO17000
November 199348.9GoodGoodVery GoodGoodFO17000
November 199148.9FairSatisfactoryVery GoodSatisfactoryFO17000

Element Data

Source: National Bridge Elements dataset, 2016 edition. This feature is experimental.
ElementUnitsQuantity1. Good2. Fair3. Poor4. Serious
Superstructure
Steel Girder/Beamlinear ft.170017000
Steel Protective Coatingsq. ft.2,80002,5202800
Timber Girder/Beamlinear ft.2,5302,530000
Steel Stringerlinear ft.300030000
Steel Protective Coatingsq. ft.1,35501,0553000
Deck
Reinforced Concrete Decksq. ft.11,32310,640668150
Wearing Surfacessq. ft.8,1127,262800500
Superstructure
Steel Floor Beamlinear ft.156015150
Steel Protective Coatingsq. ft.1,31001,270400
Substructure
Reinforced Concrete Columneach80530
Steel Abutmentlinear ft.6806800
Steel Pileeach1301300
Timber Pileeach32121442
Steel Pier Caplinear ft.3403400
Steel Protective Coatingsq. ft.828082800
Reinforced Concrete Pier Caplinear ft.6865030
Timber Pier Caplinear ft.2702600100
Joints
Other Jointlinear ft.192192000
Bearings
Movable Bearingeach20002
Fixed Bearingeach1001000
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.676676000
Steel Protective Coatingsq. ft.4,1924,192000