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.

• 1906 USGS Decorah quadrangle1:125000, 3 printings
• 1958 USGS La Crosse quadrangle1:250000, 2 printings
• 1961 USGS La Crosse quadrangle1:250000
• 1965 USGS La Crosse quadrangle1:250000
• 1975 USGS Decorah 3 NE quadrangle1:24000
• 1976 USGS La Crosse quadrangle1:250000
• 1981 USGS Calmar quadrangle1:24000
• 1985 USGS Decorah quadrangle1:100000, 2 printings

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 7 fires within 5 miles of Twin Springs between 2010 and 2020, burning about 276 acres in total. 1 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:

• Festina
• Fort Atkinson
• Calmar
• Spillville
• Conover
• Ridgeway

Every fire recorded in Winneshiek County

Regional context, not property-specific evidence. The federal mineral resources record lists 10 workings within 5 miles of Twin Springs: 9 past producers, 1 producer. 1 still produces. What was taken out: Stone, Crushed/Broken, 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 Winneshiek 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 465352. 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.