Glacier Peak

Glacier Peak, also known as Dakobed, is a tall volcano in the U.S. state of Washington. It is the fourth tallest peak in the state and can be seen from Seattle and areas north of Vancouver, such as New Westminster and Port Coquitlam. This volcano is part of the Cascade Volcanic Arc and is very isolated compared to other nearby volcanoes.

Local Native Americans have long known about Glacier Peak and told stories about it. When explorers first came to the area, they did not realize Glacier Peak was a volcano. It is located only about 70 miles northeast of downtown Seattle, making it closer to the city than the famous Mount Rainier, though it is shorter and harder to notice.

Glacier Peak has been very active in the past. It had eruptions as recently as around the year 1700. The volcano formed about one million years ago and has had some of the biggest and most powerful eruptions in Washington. In the last 3,000 years, it has erupted explosively five times, and during at least six different periods, it has had many eruptions, including two of the largest in the state.

Geology

Glacier Peak has old lava domes that make up its summit and a nearby peak called Disappointment Peak. Near the volcano, you can see old deposits left by fast-moving flows of hot rock and gas, likely from the collapse of these lava domes. There are also places where mudflows, called lahars, ran down valleys thousands of years ago.

The volcano has had many mudflows and smaller eruptions that left layers of ash. There are also three places on the mountain where lava built small cones, and a few hot springs used to flow there.

Tectonic setting

The volcano is in Washington, part of the Cascade Volcanic Arc. It formed because the Juan de Fuca Plate is slowly moving under the North American Plate at about 1.6 inches (4 cm) each year. This area has been active for millions of years, with eruptions happening at different times.

History

Many Native American people lived near Glacier Peak and saw it as a spirit, just like other volcanoes in Washington. When European explorers came, they heard stories about the mountain but didn’t map it at first. In 1850, locals told a naturalist named George Gibbs that the volcano had once "smoked." It wasn’t until 1898 that the volcano was finally put on a map.

The area was also important for Native American farming, which brought people together. Later, gold miners came in the 1870s and 1890s looking for treasure. The first white man known to see the mountain was Daniel Lindsley, who worked for the Northern Pacific Railroad Company and was looking for possible routes for railroads in 1870.

Eruptive history

Glacier Peak is a smaller volcano compared to others nearby, even though it stands tall at 10,541 feet. Its volcanic activity is limited to a smaller area above the surrounding ridge.

Glacier Peak has had big eruptions in the past 15,000 years, like Mount St. Helens. These eruptions happen when thick, sticky magma builds up and finally explodes, sending out ash and other materials. Scientists have found evidence of eruptions around the years 1700 AD, 1300 AD, 900 AD, 200 AD, 850 BC, 3150 BC, and 3550 BC. These eruptions were smaller than the big eruption of Mount St. Helens in 1980, and they created different kinds of flows and deposits.

About 13,000 years ago, Glacier Peak had a series of nine big eruptions in a short time. These caused fast-moving mudflows called lahars, which filled river valleys with deep mud. The mudflows spread as far as Puget Sound, leaving thick layers of sediment. Most of the ash from these eruptions went high into the sky and traveled hundreds of miles.

Hazards

There is a small chance, about 1 in 1,000 years, that Glacier Peak could erupt again. It is considered one of the more dangerous volcanoes in the United States because of this risk. If lahars happen again, they could danger small communities like Darrington, Arlington, and Concrete, and also affect larger towns such as Mount Vernon and Burlington. Scientists want to add more monitoring equipment to watch the volcano better, but there have been challenges in doing so because of rules protecting the wilderness area.

Climate

Glaciers

Glacier Peak has eleven big glaciers. When a person named C.E. Rusk saw them in 1906, they were starting to shrink but were still large. From a cold time called the Little Ice Age to 1958, these glaciers moved back about 5,381 feet on average. Later, in the early 1950s, the glaciers grew again because there was more snow in winter and cooler summers. Ten of the fifteen glaciers near Glacier Peak grew, moving forward from 50 to 1,575 feet. This growth stopped around 1978.

From 1984 to 2005, the glaciers moved back again, with an average of 1,017 feet. One glacier, Milk Lake Glacier, completely disappeared in the 1990s. Because the Earth is getting warmer, the area covered by ice has shrunk by a third by 2025 and is expected to almost vanish by 2075.

Recreation

The Pacific Crest Trail goes close to Glacier Peak. One special spot is where the Suiattle River crosses the trail. There used to be a bridge there, but it was washed away by big storms in 2003.

The first people to climb the mountain were Thomas Gerdine and some scientists from the United States Geological Survey in 1897. Climbing this mountain is a bit challenging, rated as Alpine Grade I or II.

For skiing, the easiest path is about 5 miles along the White Chuck River Trail and up the Sitkum Glacier. You can reach this trail by using Forest Service Road No. 23. This ski route is not too hard but can be tricky going up and down.

Cultural references

The composer Alan Hovhaness, who lived in Seattle, wrote a piece of music called "Hymn to Glacier Peak" as his Symphony no. 66. You can learn more about it at Symphony no.66 (Hovhaness).

A book named Encounters with the Archdruid by John McPhee talks about a person named David Brower who worked hard to protect nature. The book starts with a story about a disagreement over mining near Glacier Peak.