Usery Mountain Park is right across the street from Rio Salado.  

We are planning to reserve the Group site. When you register for the event, please indicate your interest in the group camping site.  The group site is 'dry' camping with a restroom and shower available. water is available in the site, but able to be "hooked up" to your vehicle.  No electric hookups.  

Fees are to be determined. If you are interested in the group site, we will give you a reservation code.

If you reserve an individual site, that will be your personal responsibility to reserve. The individual sites have water and power hookups.

https://www.maricopacountyparks.net/park-locator/usery-mountain-regional-park/