All the reasonable campgrounds and lodges in Yosemite are full tonight. Tioga Road through Yosemite just opened today! Most of the campgrounds are still closed for the season, due to snow on the ground in the upper elevations or flooding from snow melt nearer the valley.
So we had to stay outside the park tonight. Lake McSwain is a small fishing area. The campground is pretty minimal and geared towards RVs, mostly. We found a decent site not too far from the bath house and had an uneventful night.