Highway 12 information on the washout: http://www.wsdot.wa.gov/Projects/US12/WhitePassWashout/...
White Pass is another place that has some really great touring.
Other spots worth exploring: Lost Trail, near Darby MT. Hot springs nearby.
Montana Snow Bowl is a great area, sometimes low on snow, but it should be getting good there now.
A little further North everyone knows Whitefish/Big Mountain but another secret is Turner Mountain over by Libby which runs weekends only but is a super hill.
Discovery Basin is another wonderful little area near Phillipsburg Montana that has rad terrain but may not get as much snow as Alta/Snowbird in general.
Down in NE. Oregon, there's a tiny place called Anthony Lakes near Baker City that has a small chairlift, but great touring into the Crawfish Basin with cheap snowcat skiing.
Another one down that way is Ski Bluewood near Dayton, Washington. Also small, but uncrowded and known for good snow.
Finally worthy of mention is Mission Ridge near Wenatchee which is great when it snows a lot in the Cascades.