The museum contains and archive of approximately 16,000 documents and artifacts that are primarily dedicated to preserving the rich history of Riverside.
Notable pieces in the collection include a Chandelier and Wall sconce designed by George Grant Elmslie as was most of the decoration for the Babson Estate. Additionally, an original drawing of the Riverside Plan created by Frederick Law Olmsted and Calvert Vaux is on display in the East Well House archives.
Other archival materials include origins, territorial plats, maps, manuscripts, architectural drawings, records of Village management and civic organizations, Historic Structure Survey, photographic records, books, audiovisual tapes and transcriptions and artifacts. It houses many nationally significant artifacts relating to Riverside, Frederick Law Olmsted, and to the many noteworthy architects who have built structures in Riverside.