Mason County topographic map

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The Mount St. Helens major eruption of May 18, 1980 remains the deadliest and most economically destructive volcanic event in U.S. history. Fifty-seven people were killed; 200 homes, 47 bridges, 15 miles (24 km) of railways, and 185 miles (298 km) of highway were destroyed. A massive debris avalanche,…

Average elevation: 2,096 m

Mount Rainier (/reɪˈnɪər/), indigenously known as Tahoma, Tacoma, Tacobet, or təqʷubəʔ, is a large active stratovolcano in the Cascade Range of the Pacific Northwest, located in Mount Rainier National Park about 59 miles (95 km) south-southeast of Seattle. With a summit elevation of 14,411 ft (4,392…

Average elevation: 3,911 m

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Lake River, a "slow, flat slough of the Columbia River", loses only 1 foot (30 cm) in elevation over its entire 11-mile (18 km) course. It flows north, roughly parallel to the Columbia until curving slightly northwest to join it. At times, tidal fluctuations and high flows along the Columbia cause Lake River…

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Hot Springs is located east of Enumclaw and just west of Lester, along the Green River and BNSF Railway line. Its elevation is 1512 feet (460m) above sea level.

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Mica Peak is the name of two separate mountain summits in the United States located approximately 5.49 miles (9 km) apart; one in Spokane County, Washington and the other in Kootenai County, Idaho. The two peaks are located along the same ridge, which separates the Spokane Valley and Rathdrum Prairie from the…

Average elevation: 1,311 m

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Mount Ellinor is a peak in the Olympic Mountains of Washington, United States. It is located in an area designated as the Mount Skokomish Wilderness. The mountain is a popular day hike in the summer months; the summit is reachable via a steep-but-brief 3.3-mile (5.3 km) trail which gains about 3,200 feet (980…

Average elevation: 1,334 m

Average elevation: 540 m

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Average elevation: 1,421 m

Adams is one of the long-lived volcanoes in the Cascade Range, with minor activity beginning 900,000 years ago and major cone building activity beginning 520,000 years ago. The whole mountain has been completely eroded by glaciers to an elevation of 8,200 feet (2,500 m) twice during its lifetime. The current…

Average elevation: 3,235 m

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Average elevation: 1,428 m

The North Cascades features some of the most rugged topography in the Cascade Range with craggy peaks and ridges, deep glacial valleys, and granite spires. Geological events occurring many years ago created the diverse topography and drastic elevation changes over the Cascade Range leading to various climate…

Average elevation: 2,132 m

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Average elevation: 108 m