The original school convened in a converted horse barn which "kept a whiff of its original purpose...no matter hard it was cleaned." Enrollment increased from 40 students in 1906 to 190 in 1910, to 400 in 1918. The school reached a peak of over 600 in the 1960s in 12 grades. The first 8th grade class graduated in 1914. Additions to the building were constructed in 1919, 1937, 1944, and 1947. In 1940, Sacred Heart High School was dedicated. In 1943 the first two graduates of the high school matriculated.