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SR 99 over DUWAMISH RIVER

Map

Coordinates:
+47.53758, -122.33469
47°32'15" N, 122°20'05" W

Facts

Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:SR 99 over DUWAMISH RIVER
Structure number:0004872A0000000
Location:0.1 N JCT SR 509
Purpose:Carries highway and pedestrian walkway over highway and waterway
Route classification:Principal Arterial - Other Freeways or Expressways (Urban) [12]
Length of largest span:276.9 ft. [84.4 m]
Total length:3010.0 ft. [917.4 m]
Roadway width between curbs:47.9 ft. [14.6 m]
Deck width edge-to-edge:58.1 ft. [17.7 m]
Vertical clearance below bridge:410.1 ft. [125.0 m]
Owner:State Highway Agency [01]
Year built:1956
Year reconstructed:1998
Historic significance:Bridge is possibly eligible for the National Register of Historic Places [3]
Design load:MS 18+Mod / HS 20+Mod [6]
Main span material:Steel [3]
Main span design:Movable - Bascule [16]
Deck type:Closed Grating [4]

Latest Available Inspection: September 2016

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:43,677 [as of 2012]
Truck traffic:8% of total traffic
Deck condition:Fair [5 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:Basically intolerable requiring high priority of replacement [2]
Underclearances appraisal:Basically intolerable requiring high priority of corrrective action [3]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:Bank protection is in need of minor repairs. River control devices and embankment protection have a little minor damage. Banks and/or channel have minor amounts of drift. [7]
Pier/abutment protection:In place and functioning [2]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Sufficiency rating:45.8
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$69,832,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
September 2016FairFairSatisfactorySatisfactory4367745.8
September 2014FairFairSatisfactorySatisfactory4367745.5
September 2012FairFairSatisfactorySatisfactory8001845.5
October 2010FairFairSatisfactorySatisfactory3918460.0
October 2008FairFairSatisfactorySatisfactory3918456.0
July 2006FairFairSatisfactorySatisfactory1650062.4
May 2004FairFairSatisfactorySatisfactory1650062.4
September 2003FairFairGoodSatisfactory1650062.4
July 2002FairFairGoodSatisfactory1650062.4
December 2001FairFairGoodSatisfactory1650062.4
October 2000FairVery GoodGoodSatisfactory1650063.5
October 1998FairVery GoodGoodSatisfactory1650061.5
November 1996FairFairFairFair1650044.2
July 1995FairFairFairFair6256744.0
December 1994FairFairFairFair6256744.0
July 1993FairFairFairFair5897044.0
September 1991PoorPoorFairFair5897042.0

Element Data

Source: National Bridge Elements dataset, 2018 edition. This feature is experimental.
ElementUnitsQuantity1-Good2-Fair3-Poor4-Serious
Superstructure
Steel Girder/Beamlinear ft.2,0242,024000
Steel Protective Coatingsq. ft.29,35425,18102,7811,392
Prestressed Concrete Girder/Beamlinear ft.21,77721,7670100
Steel Stringerlinear ft.4,4004,396040
Steel Protective Coatingsq. ft.63,81354,74206,0473,024
Deck
Reinforced Concrete Decksq. ft.130,309130,307002
Superstructure
Steel Trusslinear ft.7206400800
Steel Protective Coatingsq. ft.104,42289,57909,8954,948
Steel Floor Beamlinear ft.928928000
Steel Protective Coatingsq. ft.13,45811,54501,275638
Steel Gusset Plateeach7272000
Substructure
Reinforced Concrete Columneach6565000
Reinforced Concrete Pier Walllinear ft.58848850500
Reinforced Concrete Abutmentlinear ft.180180000
Reinforced Concrete Pile Cap/Footinglinear ft.22000
Reinforced Concrete Pileeach1212000
Reinforced Concrete Pier Caplinear ft.800796040
Deck
Open Grid Decksq. ft.19,80019,7287110
Concrete Filled Grid Decksq. ft.12,27612,268620
Joints
Strip Seal Jointlinear ft.335033500
Compression Jointlinear ft.129012900
Open Jointlinear ft.130013000
Bearings
Elastomeric Bearingeach7979000
Movable Bearingeach2020000
Enclosed/Concealed Bearingeach44000
Fixed Bearingeach42020
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.1,1081,108000
Reinforced Concrete Bridge Raillinear ft.4,9124,912000