Emerald Lake, California

The same ground, surveyed 95 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1902 1997

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.

• 1902 USGS Santa Cruz quadrangle1:125000, 9 printings
• 1940 USGS Halfmoon Bay quadrangle1:62500, 2 printings
• 1943 USGS Halfmoon Bay quadrangle1:62500
• 1947 USGS San Francisco quadrangle1:250000
• 1948 USGS San Francisco quadrangle1:250000
• 1953 USGS Woodside quadrangle1:24000, 2 printings
• 1955 USGS San Francisco quadrangle1:250000
• 1956 USGS San Francisco quadrangle1:250000, 4 printings
• 1957 USGS San Francisco quadrangle1:250000
• 1960 USGS San Francisco quadrangle1:250000
• 1961 USGS Half Moon Bay quadrangle1:62500, 2 printings
• 1961 USGS San Francisco quadrangle1:250000
• 1961 USGS Woodside quadrangle1:24000, 4 printings
• 1964 USGS San Francisco quadrangle1:250000
• 1971 USGS San Francisco quadrangle1:250000
• 1982 USGS Palo Alto quadrangle1:100000, 2 printings
• 1985 USGS San Francisco quadrangle1:250000
• 1991 USGS Woodside quadrangle1:24000
• 1997 USGS Woodside quadrangle1:24000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 259 fires within 5 miles of Emerald Lake between 1992 and 2020, burning about 167 acres in total. 9 started naturally. 20 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:

• Emerald Lake Hills
• Palomar Park
• Redwood City
• San Carlos
• Belmont
• Devonshire

Every fire recorded in San Mateo County

Regional context, not property-specific evidence. The federal mineral resources record lists 42 workings within 5 miles of Emerald Lake: 21 producers, 19 past producers, 2 unknowns. 21 still produce. What was taken out: Stone, Crushed/Broken, Stone, Mercury, Salt. 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 Mateo 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 1786176. 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.