Twin Springs, 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.

• 1900 USGS Lancaster quadrangle1:125000
• 1904 USGS Lancaster quadrangle1:125000
• 1908 USGS Lancaster quadrangle1:125000, 5 printings
• 1956 USGS Sherrill quadrangle1:24000, 2 printings
• 1959 USGS Dubuque quadrangle1:250000
• 1961 USGS Dubuque quadrangle1:250000
• 1962 USGS Dubuque quadrangle1:250000, 2 printings
• 1976 USGS Dubuque quadrangle1:250000
• 1984 USGS Dubuque North quadrangle1:100000, 2 printings

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 13 fires within 5 miles of Twin Springs between 2009 and 2018, burning about 46 acres in total. None 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:

• Centralia
• Graf
• Bankston
• Kidder
• Lattnerville
• Budd

Every fire recorded in Dubuque County

Regional context, not property-specific evidence. The federal mineral resources record lists 13 workings within 5 miles of Twin Springs: 10 past producers, 2 unknowns, 1 producer. 1 still produces. What was taken out: Phosphorus-Phosphates, Stone, Crushed/Broken, Zinc, Lead. 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 Dubuque 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 464780. 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.