Mount St. Helens National Volcanic Monument—The online U.S. Department of Agriculture resource dedicated to learning about and visiting Mount St. Helens. This website contains information on history, nature, outdoor activities, and park conditions.
Mount St. Helens Institute—Nonprofit organization devoted to helping people understand and protect Mount St. Helens. The Institute offers field seminars, guided climbs, lecture series, work parties, and outings to enrich visitor's experiences at the volcano.
Pacific Northwest Seismic Network's Mount St. Helens Website—The premier source for information about seismic activity at Mount St. Helens.
Discover Your Northwest—A good source of books, maps, and other information relating to Mount St. Helens and the surrounding area.
Washington Department of Natural Resources geology web portal—An online service offered by the Washington Division of Geology and Earth Resources that provides access to interactive earth science mapping, data, and related information.
U.S. Army Corps of Engineers–Mount St. Helens Sediment Management—An online resource that focuses on the prevention of flooding, development and maintenance of sediment retention structures, and removal of excess sediment associated with erosion of volcanic material at Mount St. Helens.
Washington Trails Association—Information about more than 200 miles of hiking trails around Mount St. Helens. The Washington Trails Association's mission is to preserve, enhance, and promote hiking opportunities in Washington state through collaboration, education, advocacy and volunteer trail maintenance.
Summit Post Climbing Information for the Cascades Volcanoes—An resource for technical mountaineering information supported by a community of outdoor enthusiasts who share information and stories about backpacking, rock climbing, hiking, and camping.