Nice older campground you'll need a tent or smaller rig. If RV… bring leveling blocks… lots. This use to be First Come First Served but apparently it's reservable now. Getting it reserved is a website-mess though as you need to click on San Luis Reservoir SRA and then Los Banos Creek Campground. LBC doesn't even show up on the map.
https://www.reservecalifornia.com/
Sites:
1 - Good Off-season (No trees just a shade structure) - On Lake
2 - Ok - Very unlevel. Has shade structure view of lake over site 1
3 - Good Shady site, fairly level and large enough for 20' trailer / 24' RV - On Lake
4 - Good Shady site, fairly level and large enough for 20' trailer/ 24' RV - On Lake
5-9 - Ok Small, with shade structures. No obvious spot for tents but near Lake
10 - Ok Medium size and good for trailer with lots of leveling blocks… one tree for shade
11 - Meh? Small weird triangle parking spot with no obvious tent pad - On Lake and shaded
12 - Good Medium size, Lots of shade, On Lake
13-14 - Pull-throughs ? No Shade
Porta-potties were in great shape (March) to the point I'd rather have these than Pit toilets. Good Job to whoever services those!
Overall a great place to camp. Good access to the river from many of the sites and in general the river is kid-friendly (during summer). Spots vary in size wildly so larger RV's might not be a good idea. On average I'd say 30' is a max. Pit toilets are serviceable but not the best. The OHV crowd can kind of make a mess of this campground in summer (Loud music after quiet hours, riding ATV's into and out of campground despite rules against it… etc) If I had to pick a best time of year I'd say fall or spring (Open-June 1st)
Best place for groceries near by is Pioneer, CA and if you're looking for someone to cook you breakfast try Cook's Station. Cell reception is ok on AT&T
This is a great campground for hot weather (if you can get a site). Almost all the sites were fully shaded by the big redwoods. Site 211 was listed as 30' trailer but that was definitely not the case as it was a weird triangle parking area. We made it work and enjoyed the park. Nice hikes right from the site or you can drive up to where the old homestead was and see some ruins. Great campground for the kids to bike at but there are a few big hills so make sure they know how to use their brakes.