Listed on the National Register of Historic Places in 1972. 13 historic topographic surveys show this location, the earliest from 1889.
One of 16 National Register listings published here for Calaveras County · listed in 1972 · category: Building.
Sources: the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article
The ground this property stands on, surveyed 104 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 284 fires within 5 miles of Thorn House between 1992 and 2020, burning about 27,806 acres in total. 14 started naturally. 20 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 |
|---|---|
| Equipment and vehicle use | 102 |
| Missing data/not specified/undetermined | 91 |
| Debris and open burning | 38 |
| Arson/incendiarism | 20 |
| Natural | 14 |
| Power generation/transmission/distribution | 8 |
| Misuse of fire by a minor | 5 |
| Smoking | 4 |
| Other causes | 1 |
| Recreation and ceremony | 1 |
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 2020 | Missing data/not specified/undetermined | 1.0 acres | Tuolumne-Calaveras Unit | MHP OAK SHADOWS MHP CALAV |
| 9 September 2018 | Missing data/not specified/undetermined | 12 acres | California Department of Forestry & Fire Protection | RIATA |
| 9 September 2000 | Equipment and vehicle use | under an acre | Central California District | HWY 49 9 |
| 9 September 1999 | Natural | under an acre | Central California District | LIGHTNING 16 |
| 9 September 1999 | Natural | 6.0 acres | Central California District | LIGHTNING 39 |
| 7 September 2009 | Equipment and vehicle use | under an acre | Tuolumne-Calaveras Unit | MILLS |
| 7 September 1992 | Missing data/not specified/undetermined | 6.0 acres | Tuolumne-Calaveras Unit | QUAIL OAKS |
| 6 September 2012 | Natural | under an acre | Tuolumne-Calaveras Unit | 16-N 2 |
Regional context, not property-specific evidence. The federal mineral resources record lists 365 workings within 5 miles of Thorn House: 125 occurrences, 120 unknowns, 75 past producers, 45 producers. 45 still produce. What was taken out: Gold, Stone, Crushed/Broken, Silver, 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 |
|---|---|---|---|---|
| Bonanza Deposit | Iron | Occurrence | ||
| Calaveras Shale Quarry | Calcium | Producer | ||
| Casnelli | Quartz, Gold | Occurrence | ||
| Ford | Gold, Silver, Copper, Lead | Past Producer | Surface/Underground | |
| Ford | Gold, Silver, Lead, Copper | Unknown | ||
| Minnesota Mining and Milling Sherwood | Stone, Dimension | Occurrence | Gravel | |
| Rough Diamond Placer Mine | Gold, Quartz | Producer | Placer | |
| San Andreas Cement Plant | Limestone, General, Clay | Producer | ||
| Toyon Mill | Talc-Soapstone | Producer | ||
| E.A. Marsh Property J.H. Henry | Gold, Silver | Occurrence |
Regional context, not property-specific evidence. The National Weather Service names San Andreas, the town this property stands in, in 4 storm reports between 2005 and 2026: 1 hail, 1 heavy rain, 1 thunderstorm wind, 1 flood. 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 2023 | Thunderstorm Wind | San Andreas | $1,000 | There was a large tree reported down across SR12. There was a gust to 38 mph measured at Mills Ave in eastern San Andreas. |
| May 2005 | Hail | San Andreas | $10 | no account filed |
| April 2026 | Flood | San Andreas | - | California Highway Patrol reported roadway flooding at State Route 49 and State Route 12 from heavy rain. |
| October 2009 | Heavy Rain | San Andreas | - | Various locations in Calaveras County reported 4 to 6 inches of rain on the 13th. This resulted in numerous storm drains becoming clogged which caused local street flooding.||Strong, gusty winds brought down large numbers of trees, large branches, and power lines which resulted in power outages to many customers in Calaveras County. |
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 |
|---|---|---|---|
 | Calaveras County Courthouse | 0.1 miles | 1972 |
 | John J. Synder House | 0.4 miles | 1984 |
| Calaveritas Creek Bridge | 4.6 miles | 2015 |
| National Archives record | The nomination case file for reference 72000222 in Record Group 79. |
| Wikipedia article | Community-written account of this property, licensed CC BY-SA. |
| Calaveras County | All 16 listed properties in this county. |
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