Geothermal heat map of US hot springs

This interactive geothermal heat map displays 1,723 US hot springs plotted over data showing where heat from Earth's interior reaches the surface fastest, with heat flow averaging 102 mW/m² across mapped springs—1.6 times the US average of 65. Western hot springs cluster in areas where the crust has been stretched thin by faults, allowing hot rock closer to the surface and facilitating circulation of rainwater and snowmelt that emerges heated, while the cooler Eastern springs typically result from water circulating unusually deep before surfacing. Steamboat Springs, Nevada ranks as the hottest geothermal site with a heat flow of 257 mW/m² and water temperatures reaching 205°F.