Yes, and it is fairly steep. If it is icy, crampons and an ice axe may be warranted. Since it sounds like this isn't something you guys have experience with, you will want to be careful when assessing conditions. Colchuck Lake is a worthy winter backpacking objective by itself, so it isn't a a wasted trip if you don't get up Asgaard. FYI, you will likely walking from Icicle Creek, as they gate the Eightmile road in the winter.