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Mount Rainier [a] (/ r eɪ ˈ n ɪər / ray-NEER), also known as Tahoma, is a large active stratovolcano in the Cascade Range of the Pacific Northwest in the United States. The mountain is located in Mount Rainier National Park about 59 miles (95 km) south-southeast of Seattle. [9]
Mount Rainier National Park is a national park of the United States located in southeast Pierce County and northeast Lewis County in Washington state. [3] The park was established on March 2, 1899, as the fourth national park in the United States, preserving 236,381 acres (369.3 sq mi; 956.6 km 2) [1] including all of Mount Rainier, a 14,410-foot (4,390 m) stratovolcano.
The snowcapped peak of Mount Rainier, which towers 4.3 kilometers (2.7 miles) above sea level in Washington state, has not produced a significant volcanic eruption in the past 1,000 years.
Mount Rainier is an active volcano. With 28 major glaciers, it’s also the “most glaciated peak” in the contiguous U.S. and the tallest peak in the Cascade Range, according to the park.
Detailed map of Mount Rainier's summit and northeast slope showing upper perimeter of Osceola collapse amphitheater (hachured line) The Osceola Mudflow, also known as the Osceola Lahar, was a debris flow and lahar in the U.S. state of Washington that descended from the summit and northeast slope of Mount Rainier, a volcano in the Cascade Range during a period of eruptions about 5,600 years ago.
Washington has a majority of the very highest volcanoes, with 4 of the top 6 overall, although Oregon does hold a majority of the next highest peaks. Even though Mount Rainier is the tallest, Mount Shasta in California is the largest by volume, followed by Washington's Mount Adams. Below is a list of the highest Cascade volcanoes:
Wilkes calculated the height of Mount Rainier using the triangulation method to a height of 12,330 feet, approximately 2000 feet less than the actual height of the mountain. [4] The Wilkes expedition made the first successful navigation over the Naches Pass just north of Mount Rainier, which had been seen as a potential route for overland wagon ...
Mount Rainier was once known for its well-developed ice cave system, the Park Service said. Those melted away due to a warming climate. Now, ice caves are seasonal and more unstable.