There are no direct phones numbers for any of the campgrounds. There are 23 family and 23 group campgrounds. These sites charge a modest fee and can usually be reserved well in advance. Most of them are open from May to October. No Adventure Pass is required as long as your vehicle is parked within the campground.
Drinking water is available on site.
The more sophisticated campgrounds such as Serrano, Barton Flats, and San Gorgonio also have showers and electrical hookups. Parking space is provided though there may be restrictions on the number or size of vehicles. Group campsites can accommodate groups of 10-100 people. The amenities and restrictions on total number of campers and vehicles varies from site to site. There are 23 group sites.