Rivermont Collegiate is a member of the National Association of Independent Schools (NAIS),[2] specifically the Independent Schools Association of the Central States (ISACS),[3] the College Entrance Examination Board (CEEB),[4] Council for Advance and Support of Education (CASE),[5] and the National Honor Society (NHS).

In 1846, a group of transplanted New England Congregationalists with a strong social-reformer orientation formed the Trustees of Iowa College.

Griswold College began growing slowly, adding a theological department, and Kemper Hall (which served as a boys' school).

In 1883, the trustees of Griswold College received a legacy from the estate of Miss Sarah Burr (an eastern churchwoman), for the establishment of a Church School for Christian girls in the Episcopal Diocese of Iowa.

In 1973, St. Katharine's St. Mark's moved to its current location, the former home of Joseph Bettendorf, and by 1980, the school amicably broke ties with the Episcopal Church.

In 2001, the board of trustees voted to change the name of the school to Rivermont Collegiate, in order to reduce confusion about its religious affiliation.

Craftsmen added Italian marble, carved stone, molded plaster and hand-carved woodwork, doors, paneling and staircases throughout the home.

This building includes science, technology, engineering, art, and math classrooms on the first 2 levels, as well as 2 floors capable of holding 32 dorm students, in a 22,000 square foot space.