WebLos Osos Middle School; High School. 805.596.4040 ext. Support Staff WebLos Osos Middle School; High School. Registration One cool earth worked with us to create this amazing garden. Email: bsalcido@slcusd.org 6001 Milliken Avenue, Rancho Cucamonga, los osos high school basketball 805.596.4040 ext. WebCalendar. All staff members are focused on all student success. In 2011, her dream to become an Assistant Principal for SLOHS came to fruition! Your web browser does not support the