From the record
One of 63 National Register listings published here for San Mateo County · listed in 1990 · category: District.
Sources: the case file at the National Archives · the National Register database, National Park Service
Listed on the National Register of Historic Places in 1990. 19 historic topographic surveys show this location, the earliest from 1902.
One of 63 National Register listings published here for San Mateo County · listed in 1990 · category: District.
Sources: the case file at the National Archives · the National Register database, National Park Service
The ground this property stands on, surveyed 95 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.


Regional context, not property-specific evidence. The federal wildfire occurrence database lists 131 fires within 5 miles of Robert Mills Dairy Barn between 1992 and 2020, burning about 106 acres in total. 7 started naturally. 4 were recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.
| Reported cause | Fires |
|---|---|
| Missing data/not specified/undetermined | 71 |
| Equipment and vehicle use | 28 |
| Power generation/transmission/distribution | 7 |
| Natural | 7 |
| Misuse of fire by a minor | 6 |
| Debris and open burning | 4 |
| Arson/incendiarism | 4 |
| Recreation and ceremony | 2 |
| Smoking | 2 |
The most recent of them, most recent first, with the day each was reported and the service that recorded it.
| Date | Cause | Size | Reported by | Name on the report |
|---|---|---|---|---|
| 9 September 1999 | Natural | under an acre | San Mateo-Santa Cruz Unit | TUNITAS |
| 4 September 2015 | Equipment and vehicle use | 9.5 acres | San Mateo-Santa Cruz Unit | CRYSTAL |
| 25 September 2001 | Natural | 3.0 acres | San Mateo-Santa Cruz Unit | STAR HILL |
| 24 September 2015 | Missing data/not specified/undetermined | under an acre | San Mateo-Santa Cruz Unit | VERDE |
| 24 September 2006 | Missing data/not specified/undetermined | 2.5 acres | San Mateo-Santa Cruz Unit | HUDDART* |
| 21 September 2005 | Natural | 1.0 acres | San Mateo-Santa Cruz Unit | KINGS MTN |
| 2 September 2018 | Missing data/not specified/undetermined | 2.0 acres | California Department of Forestry & Fire Protection | SAN MATEO |
| 15 September 2013 | Recreation and ceremony | under an acre | San Mateo-Santa Cruz Unit | SKYLINE |
Regional context, not property-specific evidence. The federal mineral resources record lists 21 workings within 5 miles of Robert Mills Dairy Barn: 12 past producers, 7 producers, 2 unknowns. 7 still produce. What was taken out: Sand and Gravel, Construction, Gold, Calcium, Stone. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.
| Where | Site | Commodity | Status | Recorded |
|---|---|---|---|---|
| Miguel | Granite | Producer | ||
| Durham Ranch | Gold, Silver | Past Producer | Gold | |
| Durham Ranch | Gold, Silver | Unknown | ||
| Redwood Material Co. | Manganese | Producer | ||
| Redwood Material Co. | Manganese | Past Producer | ||
| Canada | Stone, Sand and Gravel, Construction | Past Producer | Sedimentary | |
| Canada | Stone, Sand and Gravel, Construction | Past Producer | ||
| Miguel | Stone, Crushed/Broken | Past Producer | ||
| Pilarcitos #138 | Stone | Producer | ||
| Pilarcitos Quarry and Plant No. 138 | Stone, Crushed/Broken | Producer |
Regional context, not property-specific evidence. The National Weather Service names Half Moon Bay, the town this property stands in, in 3 storm reports between 1998 and 2017: 2 hail, 1 tornado. No death or injury is recorded in these reports. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.
| When | Event | Place named | Harm | What the report says |
|---|---|---|---|---|
| January 2017 | Hail | Half Moon Bay | $10 | Spotter reported pea sized hail in Half Moon Bay. Other reports around San Mateo county as well. |
| February 1998 | Tornado (F0) | Half Moon Bay | - | Weak tornado ripped up some trees. Appears it began as a waterspout and moved on shore. |
| April 2017 | Hail | Half Moon Bay | - | no account filed |
United States Geological Survey topographic sheets whose coverage includes this point. Matched by taking the middle of the area the National Park Service maps for this listing, then testing that coordinate against the published boundary of every sheet.
Other National Register properties close enough to walk or drive between, ordered by distance from this one. Both positions come from the same geocoding pass that matched these properties to their map sheets.
| Photograph | Property | Distance | Listed |
|---|---|---|---|
![]() | James Johnston House | 1.9 miles | 1973 |
![]() | Methodist Episcopal Church at Half Moon Bay | 2.2 miles | 1980 |
![]() | William Adam Simmons House | 2.2 miles | 1992 |
| Pilarcitos Creek Bridge | 2.4 miles | 2014 | |
![]() | Bourn-Roth Estate | 3.6 miles | 1975 |
![]() | X-100 | 5.2 miles | 2016 |
| National Archives record | The nomination case file for reference 90000120 in Record Group 79. |
| San Mateo County | All 63 listed properties in this county. |