"I did find some promising areas south of Yosemite Valley and west of the San Joaquin river where 7-9000 ft is average elevation with lots of lakes and creeks."
That doesn't pin it down very closely. I've been all over the south half of Yosemite park. Yes, there are some moderate elevation lakes in there. However, I expect them to be overrun by mosquitos with some remaining snow. Then there are several passes leading out of the park, and you drop into National Forest, and most of that is south-facing, so the snow ought to melt off early. Kaiser Wilderness is a possibility, and there are some small peaks. Unfortunately, I think the snow conditions are unpredictable.