Old Borges Ranch
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Why it's listed
Old Borges Ranch is a working cattle ranch in the foothills of Mt. Diablo, near Walnut Creek, California. Its main buildings include a redwood farmhouse built in 1901, a horse barn from 1903, a milk and cow barn and milkhouse from 1913, a wagonshed, a second-generation house from 1937, and corrals and an early outhouse. Frank Borges, a Portuguese immigrant, and his sons built the mile-long access road in 1899, and the family used the land for cattle and dairy operations across four generations. Once part of the San Miguel Rancho land grant, the property is described as the sole surviving ranch in an area now heavily urbanized. Contra Costa County bought it in 1976 for open space, while Borges family members still lease grazing rights. Most buildings have seen only minor changes, and the farmhouse is the one structure needing rehabilitation. It preserves a picture of ranch life around 1900.
Significance in brief: The ranch is described as a prime example of a rural cattle ranch from the late 1890s and early 1900s, scarcely changed since the turn of the century. It is said to be the sole surviving ranch in an area that is now heavily urbanized. It has stayed in the Borges family for four generations and still operates as a working cattle ranch, illustrating the life of the families who settled the Walnut Creek and Concord area.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 81000147, listed July 7, 1981. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | 1035 Castlerock Rd., Walnut Creek |
|---|---|
| County | Contra Costa County |
| Listed | July 7, 1981 |
| Reference number | 81000147 |
| Resource type | District |
| Period of significance | Various dates, 1890s to present |
| Architect / builder | Unknown |
| Areas of significance | Agriculture, Exploration/Settlement |
| Level of significance | Local |
| Status (as stated in the nomination) | Publicly owned by Contra Costa County since 1976 and in use as a museum, park and working cattle ranch, with the original farmhouse deteriorated but rehabilitable and other buildings in fair to good condition. |
| Acreage | 393.8 |
| Coordinates | 37.88940, -122.00638 (NPS GIS) |
What listing means for this property
This is a historic district. Buildings within its boundary are either contributing (they add to the district's significance) or non-contributing. Owners of contributing income-producing buildings can claim the 20% federal rehabilitation tax credit; homeowners should look at state credits. National Register districts impose no design review by themselves; a local historic district ordinance, if one exists, does (the difference explained).
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 81000147.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q7083505
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.