I am in Thumper Loop! A lovely, very well maintained large campground. The area is thick grass, but a wide area is mowed around each campsite. Very pleasant place to be out of the madness of Black Hills traffic.
Planning works! This is super sweet BLM campground three miles down the road from Heise Hot Springs. There is a pleasant day use area with river access. The host closes the gate at 10 pm, which is a factor if you have driven back to the hot springs in the evening.
On good ole CA 89 a few miles north of Truckee. Drove by here many times, finally staying. Boring but handy! There are two campgrounds here about a mile apart, Lower Little Truckee and Upper Little Truckee. Theis not difference between them.
The first (lowest altitude) of the string of Inyo campgrounds on CA 168 west of Bishop. The campground itself is very much like Silver Lake CG on the June Lake Loop - exposed sites, not much shade, pleasant and quiet and level with a little stream running along the far edge.
Campground is less than a mile off 395 on a good gravel road. It's free and the campsites are quite spacious.