This was from Sunday, of course much farther west. It's typical of what you will see above 9000'.
I saw some photos from a friend flying above Red Castle over a week ago. Upper and Red Castle proper had a lot of snow and I expect still will. Lower Red Castle was peeking through, so by this week it could be intermittent.
I would expect a muddy trail with plenty of trees down. Since there are cabins and other access near Stateline Reservoir and surrounding areas I would expect the road to be open that far. Whether it is clear to the trailheads like China Meadows, I have no info. Trees down on the road could be an issue, and it's a long way to hike in if the road is blocked.
Bad idea or not all depends on your experience with snow and your idea of fun. I love early trips and sometimes you can get there before the bugs. I do not love the post holing and shin-deep bogs, but it is expected.
If you go, let us know.
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As a note to overall conditions, as of Sunday the Mirror Lake Highway was cleared past Mirror Lake. BUT, besides a little clearing at the Crystal/Trial lake, no other turnoffs or the road to ML were cleared. With the heat this weekend and next week, it is only a matter of time before the highway is declared open.
Then the mosquitofest can begin!