The high school was dedicated on August 30, 1964, and named in honor of the previous Bishop, Henry J. Althoff.

Transfer requirements include two letters of recommendation, grades, standardized test scores, and transcripts showing that classes taken are similar to Althoff's curriculum.

These are: art, business, English, foreign language, mathematics, music, physical education, science, social studies, and theology.

In addition, Health, Technology Skills, and Information Processing are all required courses for graduation.

Boys athletic teams include: lacrosse, baseball, basketball, football, golf, hockey, soccer, swimming, tennis, volleyball, and wrestling.

Girls sports include: basketball, cheerleading, golf, poms, soccer, softball, swimming, tennis, and volleyball.