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SR 99 over DUWAMISH RIVER

Map 

Coordinates:
+47.54157, -122.33496
47°32'30" N, 122°20'06" W
Source: National Bridge Inventory
Information not verified. Use at your own risk.

Facts 

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