Welcome!
I searched google (map section) for Haystack Mountain, riverside, ca. It gives a location about 5 miles sountwest of Palm Desert. I then went to Google Earth, found the spot (several large shadowed ridges) at GPS coordinates: 33deg 41'05.59"N x 116 deg 27'28.43" W. Elevation 3127'. Looks like pretty rough terrain with few access roads.
What are you looking for? Let me know if you need more help. I'll give it a shot.
Good Luck!
CAL-HUNTER