Sierra High School (Mammoth Unified School District) http://www.mammothusd.org/apps/news/category/4150 Sierra High School en-us SchoolSitePro <![CDATA[Red Day - Wednesday, February 18]]> http://www.mammothusd.org/apps/news/article/2167866 http://www.mammothusd.org/apps/news/article/2167866 Wed, 18 Feb 2026 08:27:00 -0800 <![CDATA[Registration - AERIES data confirmation!!!]]> http://www.mammothusd.org/apps/news/article/1952818 http://www.mammothusd.org/apps/news/article/1952818 Sun, 18 Aug 2024 20:00:00 -0700