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LakeQuality

Updated July 2026

Rosalys Warm Spring

Recorded at 106°F (41°C) in Idaho — classified Hot. Hotter than the 104°F limit health agencies recommend — too hot for many people, with a real risk of overheating and burns. Test the water and keep exposure short, if you enter at all.

Hotter than recommended

At 106°F this is above the 104°F ceiling the CDC and CPSC recommend for hot water. Overheating and burns are a real risk. Test the water and keep exposure short, if you enter at all.

Recorded temperature
106°F / 41°C
Classification
Hot (104–113°F (40–45°C))
State
Idaho
Coordinates
44.1010, -114.8650

What this number is, and is not

106°F is the maximum surface temperature measured at the vent during the USGS/NOAA thermal springs survey (1965–1980). It is not a current reading, and the temperature of any pool downstream of a vent is almost always lower.

This page also records nothing about access. Land ownership, legal entry, trail conditions, and whether a usable pool exists are all outside this dataset. Confirm with the managing agency before setting out.

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Frequently Asked Questions

Rosalys Warm Spring was recorded at 106°F (41°C), which classifies as Hot (104–113°F (40–45°C)). Hotter than the 104°F limit health agencies recommend — too hot for many people, with a real risk of overheating and burns. Test the water and keep exposure short, if you enter at all. That figure is the maximum surface temperature measured at the vent during the USGS/NOAA survey between 1965–1980 — not a current reading, and not the temperature of any pool downstream of the vent.

We can't tell you that, and at 106°F the question is largely settled by the temperature itself: this is above the 104°F ceiling health agencies recommend for hot water. Overheating and burns are a real risk at this temperature. Separately, this inventory records no information about land ownership, legal access, or whether a usable pool exists.

Rosalys Warm Spring is in Idaho at approximately 44.1010, -114.8650. There is no LakeQuality-graded lake within 25 miles. Coordinates come from the USGS/NOAA inventory and locate the vent, not a trailhead or parking area.

All Idaho hot springs →Hot springs by state →Lake water temperature →

Source: USGS/NOAA Thermal Springs List for the United States, via PANGAEA (CC-BY-4.0). Compilation: USGS Waring 1965 / Muffler 1979 + NOAA NGDC KGRD-12 (1980).

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