I spotted this info via City-Data about some parts of the Alcan/Alaska highway washed out due to mudslides caused by snowfall, heavy rain.
http://www.city-data.com/forum/alaska/1600575-alcan-highway-closures.html
http://www.adn.com/2012/06/08/2497330/avalanches-washouts-close-stretches.html
http://newsminer.com/view/full_story/18924850/a