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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br /> <br /> <br />Chapter 4: Hazard Identification and Risk Assessment 177 <br />Table 4-129. Volcanoes Within 1,000 Miles of Kittitas County <br />Name Location Elevation <br />(feet) Type Most Recent <br />Eruption <br />Threat <br />Potential <br />Mount Baker Whatcom County, <br />Washington 10,781 Stratovolcano 6,700 years <br />ago Very High <br />Glacier Peak Snohomish County, <br />Washington 10,541 Stratovolcano 1,100 years <br />ago Very High <br />Mount Rainier Pierce County, <br />Washington 14,410 Stratovolcano 1,000 years <br />ago Very High <br />Mount St. Helens Skamania County, <br />Washington 8,330 Stratovolcano 1980 <br />2004 – 2008 Very High <br />Mount Adams <br />Skamania and <br />Yakima counties, <br />Washington <br />(Yakama Nations Reserve) <br />12,277 Stratovolcano 3,800 years <br />ago High <br />Mount Hood <br />Clackamas and <br />Hood River <br />counties, Oregon <br />11,240 Stratovolcano 1865 AD Very High <br />Mount Jefferson <br />Jefferson, Linn, and <br />Marion Counties, <br />Oregon <br />10,495 Stratovolcano 15,000 years <br />ago <br />Low/Very <br />Low <br />Three Sisters Lane County, <br />Oregon 10,358 Complex <br />Volcano <br />2,000 years <br />ago Very High <br />Newberry Volcano <br />Deschutes, <br />Klamath, and Lake <br />counties, Oregon <br />7,986 Shield 1,300 years <br />ago Very <br />Crater Lake Klamath County, <br />Oregon 8,159 Caldera 6,600 years <br />ago Very High <br />Medicine Lake Volcano Siskiyou and Modoc <br />counties, California 7,913 Composite 950 years ago High <br />Mount Shasta Siskiyou County, <br />California 14,163 Stratovolcano 3,200 years <br />ago Very High <br />Lassen Peak Shasta County, <br />California 10,456 <br />Dome Field, <br />Volcanic <br />Field <br />1914 – 1917 Very High <br /> <br />Figure 4-22 illustrates the location of volcanoes within 100 miles of Kittitas County. The four (4) major <br />volcanoes relatively close to Kittitas County are: <br /> <br />• Glacier Peak (approximately 80 miles north northwest of the City of Ellensburg) <br />• Mount Rainier (approximately 58 miles west of the City of Ellensburg) <br />• Mount St Helens (approximately 95 miles southwest of the City of Ellensburg) <br />• Mount Adams (approximately 70 miles southwest of the City of Ellensburg) <br />Mount Hood constitutes a low hazard because of distance, direction of prevailing winds, and evidence <br />that its previous ash eruptions were confined to its immediate vicinity. <br />