Share:

SR 20 over SWINOMISH CHANNEL

Map

Coordinates:
+48.45636, -122.52186
48°27'23" N, 122°31'19" W

Facts

Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:SR 20 over SWINOMISH CHANNEL
Structure number:0011612A0000000
Location:9.3 E ISLAND CO
Purpose:Carries highway over highway and waterway
Route classification:Principal Arterial - Other Freeways or Expressways (Urban) [12]
Length of largest span:246.1 ft. [75.0 m]
Total length:3545.1 ft. [1080.5 m]
Roadway width between curbs:33.1 ft. [10.1 m]
Deck width edge-to-edge:42.0 ft. [12.8 m]
Vertical clearance below bridge:75.5 ft. [23.0 m]
Owner:State Highway Agency [01]
Year built:1981
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18+Mod / HS 20+Mod [6]
Number of main spans:5
Main spans material:Steel continuous [4]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Latex Concrete or similar additive [3]

Latest Available Inspection: February 2017

Good/Fair/Poor Condition:Good
Status:Open, no restriction [A]
Average daily traffic:15,292 [as of 2012]
Truck traffic:6% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Better than present minimum criteria [7]
Deck geometry appraisal:Meets minimum tolerable limits to be left in place as is [4]
Underclearances appraisal:Superior to present desirable criteria [9]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]
Pier/abutment protection:In place and functioning [2]
Scour condition:Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Sufficiency rating:96.5
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$49,630,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
February 2017GoodGoodGoodGood1529296.5
February 2015GoodGoodGoodGood1529296.5
February 2013FairGoodSatisfactoryGood1523796.5
February 2011FairGoodSatisfactoryGood1523796.5
March 2009FairGoodSatisfactoryGood1685796.4
April 2007FairGoodSatisfactoryGood1250097.8
April 2005FairGoodSatisfactoryGood1250097.8
March 2003FairGoodSatisfactoryGood1250097.8
August 2001FairGoodSatisfactoryGood1250095.8
May 1999FairGoodSatisfactoryGood1150295.9
March 1997FairGoodSatisfactoryGood1150295.9
April 1995FairGoodSatisfactoryGood1150296.1
May 1993GoodGoodGoodGood765096.4
August 1991GoodGoodGoodGood765096.4

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
ElementUnitsQuantity1-Good2-Fair3-Poor4-Serious
Superstructure
Steel Girder/Beamlinear ft.4,3924,392000
Steel Protective Coatingsq. ft.105,71094,139010,5711,000
Prestressed Concrete Girder/Beamlinear ft.14,35714,353130
Deck
Reinforced Concrete Decksq. ft.116,985116,977008
Wearing Surfacessq. ft.116,9850116,98500
Superstructure
Steel Pin or Pin & Hangar Assemblyeach1616000
Substructure
Reinforced Concrete Columneach2120010
Reinforced Concrete Abutmentlinear ft.8484000
Reinforced Concrete Pile Cap/Footinglinear ft.22000
Reinforced Concrete Pileeach21010
Reinforced Concrete Pier Caplinear ft.828823140
Joints
Strip Seal Jointlinear ft.429042900
Pourable Jointlinear ft.66033033
Bearings
Elastomeric Bearingeach104103010
Pot Bearingeach2416080
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.3,5453,545000
Reinforced Concrete Bridge Raillinear ft.7,0907,090000