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SR 99 over DUWAMISH RIVER

Map

Coordinates:
+47.54157, -122.33496
47°32'30" N, 122°20'06" 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:41.0 ft. [12.5 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]
Operating rating:37.0 tons [33.6 metric tons]
Inventory rating:22.0 tons [20.0 metric tons]
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

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
September 201645.8FairFairSatisfactorySatisfactoryFO43677
September 201445.5FairFairSatisfactorySatisfactoryFO43677
September 201245.5FairFairSatisfactorySatisfactoryFO80018
October 201060.0FairFairSatisfactorySatisfactoryFO39184
October 200856.0FairFairSatisfactorySatisfactoryFO39184
July 200662.4FairFairSatisfactorySatisfactory-16500
May 200462.4FairFairSatisfactorySatisfactory-16500
September 200362.4FairFairGoodSatisfactory-16500
July 200262.4FairFairGoodSatisfactory-16500
December 200162.4FairFairGoodSatisfactory-16500
October 200063.5FairVery GoodGoodSatisfactory-16500
October 199861.5FairVery GoodGoodSatisfactory-16500
November 199644.2FairFairFairFairFO16500
July 199544.0FairFairFairFairFO62567
December 199444.0FairFairFairFairFO62567
July 199344.0FairFairFairFairFO58970
September 199142.0PoorPoorFairFairSD58970

Element Data

Source: National Bridge Elements dataset, 2016 edition. This feature is experimental.
ElementUnitsQuantity1. Good2. Fair3. Poor4. Serious
Superstructure
Steel Girder/Beamlinear ft.2,0242,024000
Steel Protective Coatingsq. ft.29,35425,1812,78101,392
Prestressed Concrete Girder/Beamlinear ft.21,77721,7670100
Steel Stringerlinear ft.4,4004,396040
Steel Protective Coatingsq. ft.63,81354,7426,04703,024
Deck
Reinforced Concrete Decksq. ft.130,309130,307002
Superstructure
Steel Trusslinear ft.7206400800
Steel Protective Coatingsq. ft.104,42289,5799,89504,948
Steel Floor Beamlinear ft.928928000
Steel Protective Coatingsq. ft.13,45811,5451,2750638
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.19,80019,7366040
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