Acalanes Union High School District is a public high school district in southwest/central Contra Costa County in California. It currently has four schools: Acalanes High School in Lafayette, Campolindo High School in Moraga, Las Lomas High School in Walnut Creek, and Miramonte High School in Orinda. A fifth campus, Del Valle High School located in Walnut Creek was closed at the end of the 1978-1979 school year and remaining students were transferred to Acalanes, Campolindo, and Las Lomas High Schools. The district's alternative school, Del Oro High School, opened on the former site of Del Valle High School, closed following the 2009-2010 school year, although the district still operates adult education courses out of that campus. John Nickerson has served as the district's Superintendent s