Washington State Route 531

It runs from west to east along 172nd Street between Wenberg County Park on Lake Goodwin to a junction with SR 9 in southern Arlington, with an intermediate interchange with Interstate 5 (I-5) in Smokey Point.The highway wraps around the north end of Lake Ki and Cougar Creek and turns due east onto 172nd Street Northeast at an intersection with Forty Five Road.[4][5] The highway travels east over a set of railroad tracks into the city of Marysville, where it expands into a multi-lane road with sidewalks, bus pullouts, landscaping, a roundabout, and marked bicycle lanes.[8] The airport's main runway lies directly north of the highway, with low-flying planes making their final approach over SR 531, and the complex is ringed by a gravel multiuse trail.After it was removed from the preliminary list of projects under the Nickel Program in January 2003, a citizens group was formed to lobby elected officials for the interchange replacement.[19] The second phase of the project, a loop ramp channeling westbound traffic onto southbound I-5, began construction in March 2009 and was opened on August 28, 2009, six months ahead of schedule.[11][38][39] Due to the anticipated increase in traffic caused by new industrial development in the area, a set of parallel reliever roads are also planned to be constructed in Smokey Point.
SR 531 eastbound at 27th Avenue, approaching the I-5 interchange
Aerial view of the I-5 interchange in Smokey Point , rebuilt in stages between 2004 and 2011
Wenberg County ParkLake GoodwinMarysvilleArlingtonUnited StatesWashingtonSnohomishState highways in WashingtonInterstateScenicPre-19641964 renumberingFormerSR 530SR 532state highwaySnohomish County, WashingtonInterstate 5Smokey PointArlington Municipal Airportstate legislatureloop ramproundaboutstate parksubdivisionsNorth LakewoodLakewood High Schoolrailroad tracksbus pulloutsbicycle lanesbig-box retailerspartial cloverleaf interchangecity councilmemberstrip mallsbus stationAmazonfinal approachmultiuse trailCentennial Trailgolf coursegun rangeWashington State Department of Transportationannual average daily trafficNational Highway SystemSouth Fork Stillaguamish Riverlegislative sessionNickel Programshopping centerramp meterselementary schoolRoads and TransitSnohomish CountySeattleVancouver, BCUS 99Lake StevensWashington State LegislatureGoogle MapsMarysville GlobeThe Everett HeraldThe Arlington TimesUnited States Geological SurveyNewspapers.comThe Seattle TimesMeasuringWorthGross Domestic Product deflatorSR 500SR 501SR 502SR 503SR 504SR 505SR 506SR 507SR 508SR 509SR 510SR 512SR 513SR 515SR 516SR 518SR 519SR 520SR 522SR 523SR 524Edmonds SpurLynnwood SpurSR 525SR 526SR 527SR 528SR 529SR 530SR 532SR 534SR 536SR 538SR 539SR 542SR 543SR 544SR 546SR 547SR 548SR 599SR 514SR 537SR 540