This is a killer of a gravel road climb! It does offer some gorgeous views, though.
From Bigfork, drive north on 35. Take a right at 83 at the gas station (first stop light outside of town). Take a left onto Foothills road? at the Echo lake cafe/school/gas station corner. Take a right on 5292/Jewel Basin Road, and park there.
http://www.singletracks.com/item.php?c=1&i=3612