Sulphur Springs Look only

Sulphur Springs reads 189°F at the source (NCEI, historical reading). Managed by Valles Caldera National Preserve (checked 2026-08-19).

Cool Warm Hot Boiling-class 189°F

189°F / 87°C

Boiling-class range at the source — scalds in seconds

Reading from the NCEI Thermal Springs List (historical reading, 1981 compilation). Source temperature — lower pools usually run cooler.

Water temperatures change with flow and season — test before entering, and never submerge your head in warm natural water. CDC guidance on Naegleria fowleri.

The rule here

This is a thermal feature to see, not a place to get in the water. Valles Caldera National Preserve puts it this way:

“No swimming or bathing is permitted in Park waters.”

— Valles Caldera National Preserve, checked 2026-08-19

Worth knowing: The National Park Service added Valles Caldera to the list of park units with significant thermal features under the Geothermal Steam Act in April 2021. NPS bought the 40-acre Sulphur Springs tract — sulfuric-acid springs, fumaroles and mudpots — and says public access and visitation to the site will remain limited while it surveys the property, restores it from previous mining, eliminates safety hazards and develops visitor infrastructure.

Nearby springs

Identity, coordinates, and temperature quoted from the NCEI Thermal Springs List (historical reading, 1981 compilation).