Share:

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 2014 

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:36.6 tons [33.3 metric tons]
Inventory rating:21.8 tons [19.8 metric tons]
Evaluation:Functionally obsolete [2]
Sufficiency rating:45.5

Previous Inspections 

DateSuff. ratingEvaluationDeckSuper.Sub.ADT
September 201445.5Functionally obsoleteFairSatisfactorySatisfactory43677
September 201245.5Functionally obsoleteFairSatisfactorySatisfactory80018
October 201060.0Functionally obsoleteFairSatisfactorySatisfactory39184
October 200856.0Functionally obsoleteFairSatisfactorySatisfactory39184
July 200662.4Not deficientFairSatisfactorySatisfactory16500
May 200462.4Not deficientFairSatisfactorySatisfactory16500
September 200362.4Not deficientFairGoodSatisfactory16500
July 200262.4Not deficientFairGoodSatisfactory16500
December 200162.4Not deficientFairGoodSatisfactory16500
October 200063.5Not deficientVery GoodGoodSatisfactory16500
20000.0Not applicable---28000
October 199861.5Not deficientVery GoodGoodSatisfactory16500
November 199644.2Functionally obsoleteFairFairFair16500
July 199544.0Functionally obsoleteFairFairFair62567
December 199444.0Functionally obsoleteFairFairFair62567
July 199344.0Functionally obsoleteFairFairFair58970
September 199142.0Structurally deficientPoorFairFair58970