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LakeQuality

Updated July 2026

Keithly Warm Spring

Recorded at 86°F (30°C) in Idaho — classified Warm. Pleasantly warm and below typical hot-tub heat.
Recorded temperature
86°F / 30°C
Classification
Warm (86–99°F (30–37°C))
State
Idaho
Coordinates
44.4950, -116.7320

What this number is, and is not

86°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

Nearby hot springs

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Frequently Asked Questions

Keithly Warm Spring was recorded at 86°F (30°C), which classifies as Warm (86–99°F (30–37°C)). Pleasantly warm and below typical hot-tub heat. 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.

Keithly Warm Spring is in Idaho at approximately 44.4950, -116.7320. The nearest graded lake is Mann Creek Reservoir, about 12.7 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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