https://www.outdoorproject.com/adventures/washington/climbing/mount-thompson-west-ridge

Bernadette Benson posted this (9/16/2016):

This one could go in Canada, as well, because the trail is a 1,000 mile winter route that goes between Whitehorse, Yukon Territory, Canada and Fairbanks, Alaska, USA. It is used every February in the Yukon Quest sled dog race and the eastern/Canadian side is used every February in the Yukon Arctic Ultra foot (and ski or bike) race. It is a winter trail put in each year, with occasional sectional reroutes/diversions due to safety, dependent on weather conditions that year (e.g., jumble ice, open water on rivers).

summitpost.org:

Mount Washington is the central plug (volcanic neck) of an extinct shield volcano. Details of the mountains origin, eruptive history, geology, and geomorphology can be found at this USGS Mount Washington page

David Mitchell posted the route:

Eric Munsing posted the route (11/12/2015):

The Skier's Sierra High Route is a winter route of approximately 35 miles and 11,000ft gross elevation gain, starting at the Wolverton trailhead in Sequoia National Park, and ending at the Symmes Creek/Shepherd's Pass trailhead near Independence, CA. A rough map of the route can be found here; a more detailed map based on ground-truth GPS data would be appreciated.