Listed on the National Register of Historic Places in 1974. 22 historic topographic surveys show this location, the earliest from 1897.
“The Portola Valley School is a one-room schoolhouse that sits at 775 Portola Road in Portola Valley, California. It was added to the National Register of Historic Places in 1974.”
Wikipedia article Portola Valley School, CC BY-SA 4.0.
One of 63 National Register listings published here for San Mateo County · listed in 1974 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service
The ground this property stands on, surveyed 100 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 135 fires within 5 miles of Portola Valley School between 1992 and 2020, burning about 143 acres in total. 5 started naturally. 11 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 | 70 |
| Equipment and vehicle use | 31 |
| Arson/incendiarism | 11 |
| Misuse of fire by a minor | 7 |
| Debris and open burning | 5 |
| Natural | 5 |
| Smoking | 4 |
| Power generation/transmission/distribution | 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 |
|---|---|---|---|---|
| 6 September 2013 | Equipment and vehicle use | 1.2 acres | San Mateo-Santa Cruz Unit | ALPINE |
| 5 September 2020 | Arson/incendiarism | under an acre | San Mateo-Santa Cruz Unit | CONTROL BURN |
| 30 September 2018 | Missing data/not specified/undetermined | under an acre | California Department of Forestry & Fire Protection | NB HWY 280 / SAND HILL R |
| 3 September 2000 | Equipment and vehicle use | 2.0 acres | San Mateo-Santa Cruz Unit | RAPLEY |
| 28 September 2009 | Missing data/not specified/undetermined | under an acre | California Department of Forestry & Fire Protection | not named |
| 28 September 2005 | Misuse of fire by a minor | under an acre | San Mateo-Santa Cruz Unit | PLAYBOWL |
| 25 September 2006 | Equipment and vehicle use | 1.0 acres | San Mateo-Santa Cruz Unit | RUSSIAN |
| 23 September 2020 | Missing data/not specified/undetermined | 1.0 acres | San Mateo-Santa Cruz Unit | not named |
Regional context, not property-specific evidence. The federal mineral resources record lists 15 workings within 5 miles of Portola Valley School: 6 producers, 5 past producers, 4 unknowns. 6 still produce. What was taken out: Stone, Gold, Silver, Lead. 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 |
|---|---|---|---|---|
| Challenge | Mercury | Past Producer | 1955 | |
| J. M. Macdonough | Gold, Lead, Silver | Unknown | ||
| J.M. Macdonough Ranch | Gold, Silver, Lead | Past Producer | Gold | |
| Langley Hill Quarry | Stone, Crushed/Broken | Producer | ||
| Bahr & Ledoyen, Inc. | Stone | Producer | ||
| Bahr & Ledoyen, Inc. | Stone | Past Producer | ||
| Langley Hill Quarry | Stone | Producer | ||
| New Page Mill Quarries | Stone | Producer | ||
| New Page Mill Quarries | Stone | Past Producer | ||
| Page Mill Quarry | Stone | Producer |
United States Geological Survey topographic sheets whose coverage includes this point. Matched by taking the coordinate the National Park Service records for this property, 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 |
|---|---|---|---|
 | Our Lady of the Wayside | 0.3 miles | 1977 |
 | Casa de Tableta | 1.9 miles | 1973 |
 | Folger Estate Stable Historic District | 2.5 miles | 2004 |
| Independence Hall | 3.7 miles | 1978 | |
 | Mortimer Green Gables-Fleischhacker Country House | 4.1 miles | 1986 |
 | Woodside Store | 4.3 miles | 1985 |
| National Archives record | The nomination case file for reference 74000557 in Record Group 79. |
| Wikipedia article | Community-written account of this property, licensed CC BY-SA. |
| San Mateo County | All 63 listed properties in this county. |
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