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LakeQuality

Updated July 2026

Alpine Warm Spring

Recorded at 99°F (37°C) in Idaho — classified Ideal. In the classic hot-tub range, up to about 104°F — the comfortable window health agencies recommend for hot water.
Recorded temperature
99°F / 37°C
Classification
Ideal (99–104°F (37–40°C))
State
Idaho
Coordinates
43.2270, -111.1090

What this number is, and is not

99°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.

Graded lakes within 25 miles

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Frequently Asked Questions

Alpine Warm Spring was recorded at 99°F (37°C), which classifies as Ideal (99–104°F (37–40°C)). In the classic hot-tub range, up to about 104°F — the comfortable window health agencies recommend for hot water. 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.

This page classifies a temperature; it does not tell you whether a spring can be legally or safely reached. The inventory carries no information about land ownership, access, trail conditions, or whether a usable pool exists at all — many listed springs sit on private land or inside protected thermal areas where entry is prohibited. Confirm with the managing agency before setting out.

Alpine Warm Spring is in Idaho at approximately 43.2270, -111.1090. The nearest graded lake is Palisades Reservoir, about 1.9 miles away. 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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