It is not bad,,, the single track beginning in Idaho I've ridden,,,it is on a northeast slope,,,but never with a loaded bike,,,but I'm familiar with an atv trail bypass that would be easier if too much snow still. June may still have some snow,,,there is where I'll monitor the snowpack melt for you,,,it is really going fast this year. Massacre Mt is a shoestring ride,,, so if you want to unload and chase in there it should be worth the view,,,your stuff is in the middle of BFE so it should be safe.
This is slightly south of Massacre