Ontario Heights, Oregon

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

• 1951 USGS Malheur Butte quadrangle1:24000, 4 printings
• 1951 USGS Moores Hollow quadrangle1:62500, 3 printings
• 1955 USGS Baker quadrangle1:250000, 4 printings
• 1959 USGS Baker quadrangle1:250000, 2 printings
• 1980 USGS Brogan quadrangle1:100000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 13 fires within 5 miles of Ontario Heights between 1992 and 2020, burning about 2,562 acres in total. 1 started naturally. None was 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.

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

Settlements close enough to share some of these fires:

• Cairo
• Vale

Every fire recorded in Malheur County

Regional context, not property-specific evidence. The federal mineral resources record lists 45 workings within 5 miles of Ontario Heights: 24 past producers, 20 producers, 1 occurrence. 20 still produce. What was taken out: Sand and Gravel, Construction, Stone, Stone, Crushed/Broken, Geothermal. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Every working recorded in Malheur County

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

Matched on this settlement's Geographic Names Information System number rather than its name, so it cannot be a different place of the same name in another state.

This settlement is recorded in the Geographic Names Information System as feature 1158407. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

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.