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SR 20 North Cascade Highway closing, 6 a.m. Dec. 11It's the latest closure in more than a decade. SR 20 North Cascades Highway will close at 6 a.m. Wednesday, Dec. 11 between mileposts 134 and 171. Travelers needing to cross the Cascades can use US 2 or I-90 as alternate routes until this highway reopens in spring 2020. For information on this and other area highways, follow @WSDOT_North on Twitter for real-time information.