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SR 530 over N FK STILLAGUAMISH R

Map

Coordinates:
+48.26717, -122.01353
48°16'02" N, 122°00'49" W

Facts

Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:SR 530 over N FK STILLAGUAMISH R
Structure number:0007733A0000000
Location:7.6 E JCT SR 9
Purpose:Carries highway over waterway
Route classification:Minor Arterial (Rural) [06]
Length of largest span:278.9 ft. [85.0 m]
Total length:377.0 ft. [114.9 m]
Roadway width between curbs:25.9 ft. [7.9 m]
Deck width edge-to-edge:32.2 ft. [9.8 m]
Vertical clearance above deck:18.0 ft. [5.5 m]
Owner:State Highway Agency [01]
Year built:1966
Historic significance:Bridge is possibly eligible for the National Register of Historic Places [3]
Design load:MS 18 / HS 20 [5]
Main span material:Steel [3]
Main span design:Arch - Thru [12]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Latex Concrete or similar additive [3]

Latest Available Inspection: June 2017

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:4,373 [as of 2012]
Truck traffic:18% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Good [7 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 corrrective action [3]
Water adequacy appraisal:Equal to present minimum criteria [6]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:Bank is beginning to slump. River control devices and embankment protection have widespread minor damage. There is minor stream bed movement evident. Debris is restricting the channel slightly. [6]
Scour condition:Bridge foundations determined to be stable for assessed or calculated scour conditions; field review indicates action is required. [4]
Sufficiency rating:54.8
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$5,127,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
June 2017FairSatisfactoryFairGood437354.8
June 2015FairSatisfactoryFairGood437354.8
June 2013FairSatisfactoryFairGood492552.6
June 2011FairSatisfactoryFairGood492551.7
June 2009FairSatisfactoryFairGood537850.7
May 2007FairSatisfactoryFairGood372955.3
July 2005FairSatisfactoryFairGood372954.3
April 2003FairSatisfactoryFairGood372954.3
April 2002FairSatisfactoryFairGood372956.3
June 2001FairSatisfactoryFairGood372956.3
June 2000FairGoodSatisfactoryGood372968.6
April 1998FairGoodSatisfactoryGood372968.6
April 1997FairSatisfactorySatisfactoryFair372956.3
March 1995FairGoodSatisfactoryGood372961.2
March 1993FairSatisfactorySatisfactoryGood340070.1
August 1991PoorSeriousSatisfactoryGood247566.3