Sandy Union High School was formally established in 1917, However, in 1923, the bond was approved, and a two-story 12-classroom brick structure known as the Pioneer Building, was constructed for $30,000 (). It also contained a main office, a small
gymnasium, and an assembly hall and stage. Following the passing of the
Smith–Hughes Act,
home economics and agriculture were added to the school's curriculum in 1926. In 1936, a second building was added to the campus in 1936 with funds donated by Ed and August Bruns. Over the ensuing decades, exterior buildings and additions to the original brick structure were constructed to accommodate the increasing student body; the school was noted in 2006 for implementing a 32-camera surveillance system to ensure safety given the campus's numerous disconnected buildings. In 1984, the school implemented an integrated
environmental science vocational program, which proved to be highly successful. In 1997, operations of the high school were taken over by the then-newly formed
Oregon Trail School District. the school was officially relocated from its original location to the new campus, with the fall 2012 student body being the first to occupy the new school. As of 2017, the Oregon Trail School district was undertaking renovations on the former high school building with plans to use it as a new location for Cedar Ridge Middle School. ==Student body==