Helios Ranch

Listed on the National Register of Historic Places in 1985. 10 historic topographic surveys show this location, the earliest from 1902.

From the record

One of 88 National Register listings published here for Napa County · listed in 1985 · category: Building.

Sources: the case file at the National Archives · the National Register database, National Park Service

The listing

What is counted as historic. The nomination lists 1 building as contributing to the listing.
Address. 1575 St. Helena Hwy., St. Helena, 94574
When was it listed? May 1985
Category. building
Census division. St. Helena
National Register reference number. 85001014 - the number the National Park Service assigned this property when it was listed, and the key its nomination file is catalogued under at the National Archives.

Then and now

1902 to 1983

The ground this property stands on, surveyed 81 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

Topographic sheet covering Helios Ranch, surveyed 1983

Topographic sheet covering Helios Ranch, surveyed 1902

Fires near this property

195 since 1992

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 195 fires within 5 miles of Helios Ranch between 1992 and 2020, burning about 1,079 acres in total. 2 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	83
Equipment and vehicle use	57
Debris and open burning	28
Arson/incendiarism	11
Smoking	6
Power generation/transmission/distribution	6
Recreation and ceremony	2
Natural	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
5 September 2003	Missing data/not specified/undetermined	4.0 acres	Sonoma-Lake Napa Unit	SMOKEY OAK
28 September 1998	Smoking	under an acre	Sonoma-Lake Napa Unit	WILSON
28 September 1993	Arson/incendiarism	under an acre	Sonoma-Lake Napa Unit	WHITEHALL
25 September 2010	Equipment and vehicle use	29 acres	Sonoma-Lake Napa Unit	CONN
25 September 2000	Equipment and vehicle use	under an acre	Sonoma-Lake Napa Unit	SILVERADO
23 September 2004	Equipment and vehicle use	under an acre	Sonoma-Lake Napa Unit	ARNOLD
22 September 2011	Missing data/not specified/undetermined	1.0 acres	Sonoma-Lake Napa Unit	YOUNT
22 September 1993	Arson/incendiarism	under an acre	Sonoma-Lake Napa Unit	CASEY

Every fire recorded in Napa County

Mines and quarries near this property

10 of 36 shown

Regional context, not property-specific evidence. The federal mineral resources record lists 36 workings within 5 miles of Helios Ranch: 15 occurrences, 8 producers, 6 prospects, 5 past producers. 8 still produce. What was taken out: Mercury, Sand and Gravel, Construction, Manganese, Perlite. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Site	Commodity	Status	Recorded
Diatomite Occurrence	Diatomite	Past Producer
McLaughlin Mine	Silver, Gold, Mercury, Antimony, Arsenic, Titanium, Metal, Tungsten, Boron-Borates	Producer	1978, 1985
Glass Mountain Deposit	Stone	Occurrence	Obsidian
Glass Mountain Deposit	Stone, Crushed/Broken	Prospect
Napa Valley Stone	Stone, Crushed/Broken	Producer
Stirling	Iron	Occurrence	Hematite
Sullinger Claim	Chromium	Occurrence	Chromite
Sullinger Claim	Chromium	Prospect
Unnamed Location	Stone	Occurrence
Unnamed Location	Iron	Unknown

Every working recorded in Napa County

Maps showing this location

10 surveys

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.

1902 USGS Napa quadrangle1:125000 - 6 printings
1942 USGS Sonoma quadrangle1:62500
1947 USGS Santa Rosa quadrangle1:250000
1949 USGS Santa Rosa quadrangle1:250000 - 2 printings
1951 USGS Rutherford quadrangle1:24000 - 6 printings
1951 USGS Sonoma quadrangle1:62500 - 3 printings
1958 USGS Santa Rosa quadrangle1:250000 - 3 printings
1962 USGS Santa Rosa quadrangle1:250000
1964 USGS Santa Rosa quadrangle1:250000
1983 USGS Napa quadrangle1:100000

Listed places nearby

6 within 8 miles

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.

Property	Distance	Listed
St. Helena High School	2.0 miles	1978
Atkinson House	2.0 miles	1990
St. Helena Public Cemetery	2.4 miles	2018
William Tell Saloon and Hotel	2.5 miles	1982
Special Internal Revenue Bonded Warehouse, First District, No. 13	2.5 miles	1995
Pope Street Bridge	2.6 miles	1972

Sources for this property

National Archives record	The nomination case file for reference 85001014 in Record Group 79.
Napa County	All 88 listed properties in this county.

Provenance

Listing record. National Park Service National Register of Historic Places, listed-properties dataset, current to 2026-05-22.
Map join. Address geocoded through the United States Census geocoder, then tested against the published boundary of every sheet in the USGS Historical Topographic Map Collection.
How this page is made. Listing fields come from federal records; map-sheet coverage is a labelled coordinate-to-boundary calculation, not a source-field claim.
Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.
Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.