This list of United States thermal spring locations and temperatures.
The list includes natural surface hydrothermal features: springs, pools,
mud pots, mud volcanoes, geysers, fumaroles, and steam vents at
temperatures of 20C (68F) or greater. It does not include wells or
mines, except at sites where they supplement or replace natural vents
presently or recently active, or, in some places, where orifices are not
distinguishable as natural or artificial.
This dataset is a subset of the original, containing only thermal
springs in the continental USA. It was extracted from the original
dataset from
http://map.ngdc.noaa.gov/website/seg/hot_springs/viewer.htm