Orsa, Colorado

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.

• 1894 USGS Castle Rock quadrangle1:125000, 2 printings
• 1913 USGS Castle Rock quadrangle1:125000, 5 printings
• 1940 USGS Castle Rock quadrangle1:62500, 3 printings
• 1945 USGS Castle Rock quadrangle1:62500, 2 printings
• 1953 USGS Denver quadrangle1:250000, 6 printings
• 1957 USGS Denver quadrangle1:250000
• 1958 USGS Denver quadrangle1:250000
• 1960 USGS Denver quadrangle1:250000
• 1965 USGS Sedalia quadrangle1:24000, 4 printings
• 1983 USGS Castle Rock quadrangle1:100000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 373 fires within 5 miles of Orsa between 1992 and 2020, burning about 1,221 acres in total. 19 started naturally. 15 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.

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:

• Castle Pines Village
• Castle Rock
• Happy Canyon
• Monte Vista Estates
• Sedalia
• Silver Heights

Every fire recorded in Douglas County

Regional context, not property-specific evidence. The federal mineral resources record lists 14 workings within 5 miles of Orsa: 12 producers, 1 unknown, 1 past producer. 12 still produce. What was taken out: Stone, Clay, Stone, Dimension, 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.

Every working recorded in Douglas County

Regional context, not property-specific evidence. The National Weather Service names Orsa in 4 storm reports between 2010 and 2013: 3 hail, 1 thunderstorm wind. 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.

Every storm recorded in Douglas County

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

This settlement is recorded in the Geographic Names Information System as feature 185079. 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.

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.