The trailhead is on the North Fork Tieton River Road, but the road is closed about three miles short of the trailhead. Plan for a little extra walking. Trail 1118 is in good shape, with just a few easy blowdowns to cross, a moderate grade through forest for about four and a half miles to Tieton Pass.
At the pass I turned south on the PCT, passed Lutz Lake and turned onto the little spur trail that leads into McCall Basin.
The basin is really two basins a quarter mile apart. The lower basin is more or less round, about a half mile in diameter. There are several large meadows separated by forested areas and several small creeks. Many camps are available, or one could just pitch a tent in a meadow. The Devil's Horns are visible to the southeast, as well as the north flank of Tieton Peak.
The unmaintained trail 1151 is supposed to lead to the lower basin from Tieton Meadows – an alternate route from the same trailhead. I looked hard for the upper end of that trail, and found several that might have been it. They all looked more appropriate for elk than for humans. If the trail is still passable, it probably would be rough going, and not much shorter than taking 1118. In other words, not worth the trouble.
Ten minutes' climb above the lower basin gets you to the upper basin. This is a flat, oblong area about three quarters of a mile long, mostly glacial till with braided streams running through. The basin floor is partly bare, partly covered with scrubby willows and bushes, and a few small meadows. Only one camp is available, about a quarter mile west of the entrance to the basin, but other tents could be pitched in a meadow. The south wall of the basin rises steeply about 600 feet, mostly rock and scree.
There were no bugs to speak of on the trail, and few in either basin. Lots of water is available everywhere now.
I spent a whole day exploring the upper basin. The rocky west end of it is above tree line, with unlimited opportunities for scrambling. Several creeks and impressive waterfalls channel runoff from the many snowfields and small glaciers above. The highest point to the west is the watershed of the Cascades, just north of Old Snowy, and the PCT runs right along the ridge for a short time there. One can see the hikers moving along the horizon, nearly a mile away, and 500 feet above.