Sedro-Woolley to Elma to Sedro-Woolley, WA (869.5 mi.) These two map sections offer a variety of options for creating the ultimate loop tour in Washington State from the Olympic Mountains, across the Cascades, down into the Columbia Basin and back again with multiple ferry options in Seattle to round things out. For more information on this route or to print out the most up to date addenda for these maps please click on link: Washington Parks Route