Did a very cool mtb ride that started at gold lake and ended in downieville years ago.
For the most part all downhill, amazing meadows and creeks.
It was multi-purpose like you mentioned. Did not see many vehicles though.
A few jeeps on the double track sections, some 4x campers in one of the meadows, and near the end a couple guys on dual sports.
The only sketchy part was just about near the end, some narrow rocky trials with steep rocky 20-30ft drops to the left.
Give big space to the festive dog that makes sport in roadway.
Avoid entanglement of dog with wheel spokes. - Old Honda Manual
If you wish to travel far and fast, travel light. Take off all your envies,
jealousies, unforgiveness, selfishness, and fears. -- Glenn Clark