Image - Simon Fraser University (foreground) Kulshan Stratovolcano© /Mount Baker Stratovolcano© (background) [https://mountbakerstratovolcano.blogspot.com/]  ~  Original Image by Stan G. Webb - In Retirement ©   [https://stangwebb.blogspot.com/]

Dorr fumaroles Mount Baker's summit

Dorr fumaroles 2375 m (7800 ft) elevation at the base of the Cockscomb, the rocky, rugged northeast ridge of Mount Baker dividing the Park and Rainbow Glaciers (also see the map on the ‘About MBVRC’ page).  Mount Baker's summit
North East

Mapping fumaroles at Baker's Dorr Fumarole Field. Figure 1. ... A fumarole field is an area with volcanic steam vents. Other than the numerous steam vents in Sherman Crater south of Mount Baker's summit, the Dorr fumaroles are the only known center of fumarolic activity on Mount Baker.

Dorr Fumarole Field Trip - Mount Baker Volcano Research Center

www.mbvrc.wwu.edu/news/dorrtrip.html

Baker’s Dorr Fumarole Field Overlooking Wahlachean Lake

The following report and photos were provided to MBVRC by Dr. Jeff Witter, Vancouver, B.C. Jeff studies gas emissions at active volcanoes. He heads up the International Volcano Monitoring Fund, a non-profit organization that seeks to assist third world volcano monitoring programs.

Visit the website: http://ivm-fund.org

Figure 1. The Dorr Fumarole Field is located high on the NE flank of Mount Baker and is much smaller than the main area of steam vent activity at Sherman Crater.

“Mapping fumaroles at Baker’s Dorr Fumarole Field

On July 25 – 27, 2009, Jeff Witter and Ryan Wilson crossed steep ice slopes and glaciers to map the little-known Dorr fumarole field. These fumaroles are at ca 7800 ft (2375 m) elevation at the base of the Cockscomb, the rocky, rugged northeast ridge of Mount Baker dividing the Park and Rainbow Glaciers (also see the map on the ‘About MBVRC’ page).

Their goal was to make a map of the extent and geologic characteristics of the fumarole field as well as to assess current fumarolic activity for comparison with previous reports. A fumarole field is an area with volcanic steam vents. Other than the numerous steam vents inSherman Crater south of Mount Baker’s summit, the Dorr fumaroles are the only known center of fumarolic activity on Mount Baker. Access to the Dorr fumarole field is not easy and requires a rope, an ice ax, and glacier travel experience. An overnight camp on Ptarmigan Ridge is required if any time is spent working at the fumaroles.At Dorr, the steam vent activity has converted the nearby rocks into clay and other minerals in a process called hydrothermal alteration, the result of sulphur-rich gas emitted by the fumaroles.

Jeff and Ryan’s mapping revealed that the Dorr fumarole field is a ~400 m long x ~100 m wide N-S trending zone consisting of various types of hydrothermally altered ground; this is relatively small compared to other fumarole fields. The central and southern portions of the fumarole field are punctuated by numerous steam vents with the most vigorous steaming activity concentrated in the south.

During the July 2009 visit, no less than 12 individual steam vents were mapped. Several more steam vents were observed but not mapped in the southernmost sector of the fumarole field and on a rubbly slope beneath an ice cliff considered too hazardous to approach. The maximum temperature measured in the Dorr steam vents was 90 ºC, which is equivalent to the boiling point of water at that elevation, and comparable to most vents in Sherman Crater.

Steam emissions at the mapped vents were generally weak and wispy, easily dissipated by a light breeze. Observations at the Dorr fumarole field in July 2009 are in marked contrast to previous observations. In August 1990, Dave Tucker reported “hundreds” of thumb-sized steam vents scattered about the fumarole field. These qualitative observations suggest that activity at the Dorr fumaroles has decreased since 1990, consistent with studies concluding that the overall activity at Mount Baker volcano has been decreasing since the “failed eruption” of 1975 (e.g. Werner and others, 2009. See MBVRC References webpage.)

The team from the IVM-Fund plan to return to the Dorr fumaroles next summer to make quantitative measurements of the steam emissions to serve as baseline values for comparison with future measurements. A USGS-sponsored team also plans to visit the fumaroles in summer 2010 to collect gas samples for the first-ever chemical analyses of Dorr fumaroles gases.”

What would happen if Mount Baker erupted?

Of course, nothing is mentioned here about the impact north of the Canadian border, 18 kilometres to the north; nor risk, in particular, on the Wahleach Hydro Project.
https://youtu.be/o_-xbEJcjG8   [1:30 minutes]

Wahleach Falls Generating Station

Built: 1952

Generating capacity: 65 MW

Bellingham Herald
Published on May 8, 2018

With renewed interest following the eruption of Hawaii's Kilauea volcano, geologists say the biggest threat from Pacific Northwest volcanoes like Mount Baker is not lava, but mud and debris flows.

[This Webb Editor continues comments:  better comparisons should be made along the Cascadia Volcanic Arc; in particular Mt. Meager Mastif  has seen ongoing activity.]