There's guy who put up a blog of his AoMM ride - he says that Bill's Hill starts out flat than goes right to 7%, and that most of it is 9-12%........it's also a mile long climb, so I bet that it starts to really spread out as soon as the climb starts.....(except for that front pack, of course, which I won't see after 6:30AM).

AoMM Journal

Here are pics of the Bill's Hill climb:





On the BRP climb, he said it was 10-12 miles of "unrelenting" climbing, of nothing less than 6%, with some climbs over 13%.