There are two parking areas. The first is in the shaded area near the trailhead. I’m guessing there are about 40-50 overnight parking spaces in this area. This is the preferred parking area because of its proximity to the trailhead, store, the walk-in camping area and the shade. There are bear boxes in this area and they are generally overly full.
The overflow/secondary parking area probably has another 100 parking spots and is a couple hundred yards down the portal road. There’s not much shade in this lot. I don’t ever think I’ve seen this lot full, but I’ve never been around mid day when all the tourons show-up. This lot has bear boses too.
The walk-in camping is mostly behind the upper parking area, but there are a couple spots between the two parking areas. The Forest Service web site says there 10 sites, although I suspect there are a few more than that. They cost $10 per night (self pay) but if you’re in late and out early…