This maps seems incomplete. Gaia Topo shows E Branch crossing creek at current end and then turning into Beta Lake Road. We followed Beta Lake Road to drivable end for access to the Knuckles. I think this first section was fine, but it definitely got rougher on Beta Lake Road. A proper 4x4 may be required.
[From AvCan] - Clear to the start of E100. Patchy to the second washout under the waterfalls… which has a small new wash out! A few rocks had to be moved, but it is passable by quad. Further up on E100 pallet snow bridges are holding up well with 4-6ft snow walls on the exposed creeks.