I learned there is no more trail to Lake Byrne except via Lost Creek Ridge b/c of the Nov 03 floods, but the ranger recommended a great alternative just down the road. I hiked trail #649 along the North Fork Sauk River, up the ridge, to the PCT intersection. From the fantastic meadows up there, I continued on past White Pass until the trail bent around a small peak and approached Reflection Pond. The views all along the ridge from the PCT to Reflection Pond are impressive. Glacier Peak hovering above the ridge on the opposite side of the White River Valley, the White River Glacier, Indian Head Peak, Monte Cristo Peaks, and in the distance, once you approach Reflection Pond, Mt Stuart and I think Mt Daniel. But even without any views, the meadows in the White Pass area are pretty amazing.
The hike along the N Fork Sauk is a great forest and river hike with some huge trees to accompany you along the way. Most of the river has obvious signs of the huge floods that affected that area in Nov 03, in the form of giant boulders and re-directed water channels. Really incredible that this trail is even still open, but there are also parts that have been recently repaired and repaired well. There are good campsites about 5 miles in on the river, which is the obvious thing to do before tackling the switchbacks up to the White Pass meadows. I wouldn't recommend hiking the switchbacks in the middle of the afternoon. Even going down in the afternoon heat was pretty trying! Look for some ripe wild blackberries on about the 3rd or 4th switchback.
Bugs (black flies, horse flies, some mosquitos) are much worse in the afternoon of course, but didn't bother me if i kept moving. A horsefly did take a chunk out of my calf when i stopped to splash some Sauk River on my face, but that was the only bite I had the whole day.
My only regret was not being able to spend about 3 days looping around on the PCT down Pilot Ridge or something.