Alta, 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.

• 1897 USGS Telluride quadrangle1:62500
• 1904 USGS Telluride quadrangle1:62500, 2 printings
• 1945 USGS Durango quadrangle1:250000, 3 printings
• 1953 USGS Durango quadrangle1:250000
• 1954 USGS Durango quadrangle1:250000, 2 printings
• 1955 USGS Telluride quadrangle1:24000, 8 printings
• 1955 USGS Telluride quadrangle1:62500, 5 printings
• 1961 USGS Durango quadrangle1:250000
• 1963 USGS Durango quadrangle1:250000
• 1966 USGS Durango quadrangle1:250000, 2 printings
• 1982 USGS Silverton quadrangle1:100000, 3 printings

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 35 fires within 5 miles of Alta (historical) between 1993 and 2020, burning about 232 acres in total. 7 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:

• Ames
• Ophir
• Ophir Loop
• Ilium
• Keystone
• Mountain Village

Every fire recorded in San Miguel County

Regional context, not property-specific evidence. The federal mineral resources record lists 157 workings within 5 miles of Alta (historical): 87 past producers, 51 unknowns, 11 occurrences, 8 producers. 8 still produce. What was taken out: Gold, Silver, Lead, Silver, Copper, Lead, Silver, Zinc. 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 San Miguel 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 187155. 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.