Hubert H. Bancroft Ranch House, Historic adobe farmhouse in Spring Valley, United States.

The Hubert H. Bancroft Ranch House is a single-story adobe structure with a frame addition, each section under a gabled roof of wooden shingles. The adobe roof extends over an open veranda supported by square posts. Curved timbers salvaged from the wrecked coal freighter Clarissa Andrews are embedded in the oldest adobe portion.

Augustus Ensworth built the structure in the 1850s before it became home to historian Hubert Howe Bancroft in 1885. Bancroft later transformed the original farm into a substantial estate and made it the center of his extensive collection of regional materials.

The house is named for Hubert Howe Bancroft, whose 39-volume history of western North America appeared between 1882 and 1890. His research library of more than 60,000 volumes is now at the University of California, Berkeley. The property also holds El aguaje de San Jorge, the spring from which Spring Valley takes its name.

The house stands at 9050 Memory Lane, a short lane off Bancroft Drive in western Spring Valley, just northwest of Bancroft County Park. The adobe section's roof extends over an open veranda held up by square posts, and a short white picket fence runs in front. The rock structure Bancroft built in the 1880s as a schoolhouse and fireproof storehouse stands in the adjacent park.

The house contains beams salvaged from the Clarissa Andrews, a coal freighter that sank in San Diego Bay. These unusual building materials connect the structure directly to a local maritime disaster.