Big Rock, Iowa

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.

• 1954 USGS Waterloo quadrangle1:250000, 4 printings
• 1955 USGS Waterloo quadrangle1:250000, 2 printings
• 1963 USGS Waterloo North quadrangle1:24000, 2 printings
• 1984 USGS Waverly quadrangle1:100000, 2 printings

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 18 fires within 5 miles of Big Rock (historical) between 2001 and 2014, burning about 40 acres in total. None started naturally. 1 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:

• Armour
• Crain Creek (historical)
• Edwards (historical)
• Eastgate Estate Park
• Hilltop
• Dewar

Every fire recorded in Black Hawk County

Regional context, not property-specific evidence. The federal mineral resources record lists 11 workings within 5 miles of Big Rock (historical): 8 past producers, 2 producers, 1 unknown. 2 still produce. What was taken out: Sand and Gravel, Construction, Stone, Crushed/Broken. 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 Black Hawk 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 464149. 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.