Brossart, John F. and Julia House

Listed on the National Register of Historic Places in 2024. 21 historic topographic surveys show this location, the earliest from 1894.

From the record

One of 616 National Register listings published here for Los Angeles County · listed in 2024 · category: Building.

Sources: 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. 512 S. Ivy Avenue, Monrovia, 91016
When was it listed? March 2024
Category. building
Census division. Upper San Gabriel Valley
National Register reference number. 100010097 - assigned by the National Park Service when the property was listed.

Then and now

1894 to 1995

The ground this property stands on, surveyed 101 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

Topographic sheet covering Brossart, John F. and Julia House, surveyed 1995

Topographic sheet covering Brossart, John F. and Julia House, surveyed 1894

Fires near this property

364 since 1992

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 364 fires within 5 miles of Brossart, John F. and Julia House between 1992 and 2020, burning about 6,021 acres in total. 1 started naturally. 53 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	173
Arson/incendiarism	53
Equipment and vehicle use	42
Smoking	29
Misuse of fire by a minor	26
Debris and open burning	14
Recreation and ceremony	14
Power generation/transmission/distribution	7
Fireworks	4
Natural	1
Other causes	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
8 September 2006	Missing data/not specified/undetermined	17 acres	Angeles National Forest	GUN
7 September 1994	Arson/incendiarism	5.0 acres	Angeles National Forest	DUARTE
5 September 2019	Missing data/not specified/undetermined	under an acre	Los Angeles County Fire Department	not named
5 September 2006	Missing data/not specified/undetermined	under an acre	California Department of Forestry & Fire Protection	not named
5 September 2006	Missing data/not specified/undetermined	under an acre	California Department of Forestry & Fire Protection	not named
30 September 1992	Arson/incendiarism	under an acre	Angeles National Forest	WILDERNESS
3 September 2019	Debris and open burning	under an acre	Los Angeles County Fire Department	not named
3 September 2011	Missing data/not specified/undetermined	under an acre	Los Angeles County Fire Department	not named

Every fire recorded in Los Angeles County

Mines and quarries near this property

10 of 65 shown

Regional context, not property-specific evidence. The federal mineral resources record lists 65 workings within 5 miles of Brossart, John F. and Julia House: 47 past producers, 8 prospects, 6 producers, 4 occurrences. 6 still produce. What was taken out: Sand and Gravel, Construction, Gold, Silver, Gold, Sand and Gravel, Construction. 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
Felix	Fluorine-Fluorite	Prospect
Fish Canyon Quarry	Stone, Crushed/Broken	Past Producer
Hacienda Heights	Sand and Gravel, Construction, Gold, Silver	Past Producer
Largo Sand and Gravel	Gold, Sand and Gravel, Construction	Prospect	Sedimentary
Sierra Vista	Tungsten	Occurrence
Sunburst Pit	Stone, Dimension	Past Producer
Winter Creek	Molybdenum, Gold, Silver, Copper	Occurrence	Bornite, Chalcopyrite, Molybdenite
Winter Creek	Copper, Gold, Molybdenum, Silver	Past Producer
Winter Creek Group	Molybdenum, Gold, Silver, Copper	Occurrence	Vein
Winter Group	Copper, Silver, Gold, Molybdenum	Occurrence	Bornite, Chalcopyrite, Malachite, Pyrite

Every working recorded in Los Angeles County

Storms near this property

1 since 2000

Regional context, not property-specific evidence. The National Weather Service names Monrovia, the town this property stands in, in 1 storm report in 2000: 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
February 2000	Flood	Monrovia	-	no account filed

Every storm recorded in Los Angeles County

Maps showing this location

21 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.

1894 USGS Pomona quadrangle1:62500
1897 USGS Pomona quadrangle1:62500
1898 USGS Pomona quadrangle1:62500 - 2 printings
1901 USGS Southern California Sheet No. 1 quadrangle1:250000 - 6 printings
1904 USGS Pomona quadrangle1:62500 - 7 printings
1904 USGS Southern California Sheet No. 1 quadrangle1:250000 - 2 printings
1925 USGS Azusa quadrangle1:24000
1928 USGS Azusa quadrangle1:24000 - 3 printings
1933 USGS Azusa quadrangle1:24000
1939 USGS Azusa quadrangle1:24000 - 3 printings
1953 USGS Azusa quadrangle1:24000 - 2 printings
1953 USGS San Bernardino quadrangle1:250000 - 2 printings
1956 USGS San Bernardino quadrangle1:250000
1957 USGS San Bernardino quadrangle1:250000
1958 USGS San Bernardino quadrangle1:250000
1959 USGS San Bernardino quadrangle1:250000
1966 USGS Azusa quadrangle1:24000 - 5 printings
1966 USGS San Bernardino quadrangle1:250000
1976 USGS Azusa quadrangle1:24000
1982 USGS San Bernardino quadrangle1:100000
1995 USGS Azusa quadrangle1:24000

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
Luther and Adah Blair House	0.1 miles	2024
Aztec Hotel	0.5 miles	1978
Oaks, The	0.7 miles	1978
Upton Sinclair House	1.1 miles	1971
John Carlton Pegler House	3.0 miles	1988
Queen Anne Cottage and Coach Barn	3.1 miles	1980

Sources for this property

National Archives record	The nomination case file for reference 100010097 in Record Group 79.
Los Angeles County	All 616 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.
Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.