Scott's or "Puke Hill", bear of a climb. As the local population may say, "oh my heck". Use to live between Big and Little Cottonwood Canyons. We'd park down at Reynolds flats below Solitude, ride up to Brighton on the Canyon road then up Puke Hill to the Wasatch Crest. The spine you mention is the backside of 9990 at the Canyons, got struck by lightning on my bike there...not cool! If you took a left and went down by Desolation Lake, the Mill D trail is one blast of a downhill. Did allot of backcountry skiing through there as well.
Head over to The Canyons or the other end Deer Valley and ride Mid-mountain. 8k elevation nap of the earth kind of riding, less climbing and great views.
All kinds of cool trails in them parts. Great pics, bring back some good memories. Good on ya! Not an easy route.