Mount Rainier

Mount Rainier is an active stratovolcano (also known as a composite volcano) in Pierce County, Washington, located 54 miles (87 km) southeast of Seattle. It towers over the Cascade Range as the most prominent mountain in the contiguous United States and Cascade Volcanic Arc at 14,411 feet (4,392 m).

The mountain and the surrounding area are protected within Mount Rainier National Park. With 26 major glaciers and 35 square miles (91 km2) of permanent snowfields and glaciers, Mount Rainier is the most heavily glaciated peak in the lower 48 states. The summit is topped by two volcanic craters, each over 1,000 feet (300 m) in diameter with the larger east crater overlapping the west crater. Geothermal heat from the volcano keeps areas of both crater rims free of snow and ice, and has formed the world's largest volcanic glacier cave network within the ice-filled craters. A small crater lake about 130 by 30 feet (40 m × 9.1 m) in size and 16 feet (5 m) deep, the highest in North America with a surface elevation of 14,203 feet (4,329 m), occupies the lowest portion of the west crater below more than 100 feet (30 m) of ice and is accessible only via the caves.

Mountain climbing on Mount Rainier is very difficult; it involves climbing on the largest glaciers in the U.S. south of Alaska. Most climbers require two to three days to reach the summit. Climbing teams require experience in glacier travel, self-rescue, and wilderness travel. About 8,000 to 13,000 people attempt the climb each year, about 90% via routes from Camp Muir on the southeast flank. Most of the rest ascend Emmons Glacier via Camp Schurman on the northeast. About half of the attempts are successful, with weather and conditioning being the most common reasons for failure.

About three mountaineering deaths each year occur due to rock and ice fall, avalanche, falls, and hypothermia associated with severe weather. The worst mountaineering accident on Mount Rainier occurred in 1981, when eleven people lost their lives in an ice fall on the Ingraham Glacier. This was the largest number of fatalities on Mount Rainier in a single incident since 32 people were killed in a 1946 plane crash on the South Tahoma Glacier.

Info courtesy of Wikipedia