Vivian creek is flowing at Vivian Creek campground and just below Halfway campground. Flow is strong enough to create cascades over rocks and logs. In between the two camps, the creek must be underground as the creek bed is just moist mud for almost a mile.
High Creek is flowing at High Creek camp. Picture attached.

We only encountered one small patch of snow next to the trail on our hike to the summit. At the top there were some snow fields a few hundred feet away, but there is not much left.
No mosquitoes. Lucky us!