Listed on the National Register of Historic Places in 1987. 10 historic topographic surveys show this location, the earliest from 1896.
“The Shannon-Williamson Ranch, is located in Antioch, California. The Williamson family settled in Antioch in 1867.”
Wikipedia article Shannon-Williamson Ranch, CC BY-SA 4.0.
One of 49 National Register listings published here for Contra Costa County · listed in 1987 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service
Regional context, not property-specific evidence. The federal wildfire occurrence database lists 638 fires within 5 miles of Shannon-Williamson Ranch between 1992 and 2020, burning about 2,852 acres in total. 1 started naturally. 130 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 | 283 |
| Arson/incendiarism | 130 |
| Equipment and vehicle use | 72 |
| Smoking | 68 |
| Misuse of fire by a minor | 60 |
| Debris and open burning | 22 |
| Recreation and ceremony | 1 |
| Natural | 1 |
| Power generation/transmission/distribution | 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 | under an acre | Santa Clara Unit | not named |
| 9 September 2019 | Misuse of fire by a minor | 3.0 acres | Santa Clara Unit | not named |
| 9 September 2011 | Smoking | under an acre | Santa Clara Unit | not named |
| 7 September 2018 | Missing data/not specified/undetermined | under an acre | California Department of Forestry & Fire Protection | not named |
| 7 September 2018 | Misuse of fire by a minor | under an acre | California Department of Forestry & Fire Protection | not named |
| 7 September 2017 | Arson/incendiarism | under an acre | California Department of Forestry & Fire Protection | not named |
| 7 September 1992 | Arson/incendiarism | under an acre | Santa Clara Unit | DEER VALLEY #3 |
| 6 September 2009 | Arson/incendiarism | under an acre | California Department of Forestry & Fire Protection | not named |
Regional context, not property-specific evidence. The federal mineral resources record lists 32 workings within 5 miles of Shannon-Williamson Ranch: 9 prospects, 8 past producers, 7 producers, 6 occurrences. 8 still produce. What was taken out: Sand and Gravel, Construction, Stone, Mercury, Silica. 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 |
|---|---|---|---|---|
| 1b Du Pont B Plant Ti | Titanium, Pigment | Plant | 1963 | |
| Antioch Paving Co. | Stone, Crushed/Broken | Producer | ||
| Silica Company of Calif. | Silica, Sand and Gravel, Construction | Past Producer | Sedimentary | |
| Unnamed Location | Calcium | Producer | ||
| Unnamed Location | Calcium | Past Producer | ||
| Antioch | Silica | Producer | ||
| Antioch-Marchio | Silica, Sand and Gravel, Construction | Prospect | ||
| Marchio Sand Company Antioch-Marchio | Silica | Occurrence | Sand | |
| Holland Sandstone Brick Co. | Mercury | Past Producer | ||
| Unnamed | Stone | Occurrence |
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 |
|---|---|---|---|
 | John Marsh House | 4.7 miles | 1971 |
 | Black Diamond Mines | 5.2 miles | 1991 |
 | Roswell Butler Hard House | 5.3 miles | 1993 |
 | Riverview Union High School Building | 5.5 miles | 1998 |
| National Archives record | The nomination case file for reference 87000003 in Record Group 79. |
| Wikipedia article | Community-written account of this property, licensed CC BY-SA. |
| Contra Costa County | All 49 listed properties in this county. |
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