Across Washington State, hydroelectric dams are blocking salmon as they migrate to their spawning grounds. Enter the salmon cannon. Ingrid Taylar/Flickr hide caption

itoggle caption Ingrid Taylar/Flickr

Amber McGowan, left, and Krystal Klacsan work Monday at Cannabis City in Seattle, a day before the store is to begin legal pot sales on Tuesday. The store will be for now the only one in Seattle to sell recreational marijuana. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP

Marine One, carrying President Obama, takes an aerial tour of Oso, Wash., on Tuesday. The president made a brief stop in the area devastated by last month's mudslide. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP