SR 20 (North Cascades Highway) is closed

November 17, 2009. SR 20, the northern most route to Winthrop is closed for the winter season. WSDOT's February 22, 2010 assessment trip to the North Cascades produced a target date of March 22 to begin the reopening effort. For more information, visit the North Cascades Highway web page. For further details on mountain pass conditions, click here or call Washington State Dept of Transportation at 511 for their automated travel service.