It's Mt Rainier, an ACTIVE Volcano of 14,400ft.
It's covered by 36 sq miles of glaciers.
150,000 people live on it's most recent medflows/lahars.
If it were to blow like St Helens it would take out 6-8 good sized towns and easily kill 300,000 people. Most would drown in the cubic mile of water it would shed.
Rainier is dangerous given the issues you’ve mentioned, but Glacier Peak is probably the most threatening; it has a tendency to develop lava domes on its flanks and these not only have the capacity to lead to large lahars, slides coming off it have dammed the Sauk, Stillaguamish and Skagit and altered their courses. The debris flow that that makes up the Skagit flats and the Mt Vernon, Burlington, Sedro Wooley area was from a single event and represents 10 cubic miles of mud. At 10,500 it’s big, but because of its location it really can’t be seen and is basically ignored. But despite the fact that it has been one of the most active Cascade volcanoes, it has the least amount of monitoring.