On October 2, 2001, a 25-30 foot NW swell hit the Pacific Northwest, the biggest NW swell in more than a decade. NW swells enter the Straights of Juan de Fuca (the gap of ocean between the Olympic peninsula of Washington state and the southern tip of Vancouver Island). These NW swells create waves either when they run into points of land or into underwater river jetties formed where rivers from the Olympic mountains flow into the ocean.