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LakeQuality

Updated July 2026

Hardboard Spring

Recorded at 70°F (21°C) in Oregon — classified Cool. Tepid water, well below body temperature — more a cool dip than a warm soak.
Recorded temperature
70°F / 21°C
Classification
Cool (below 86°F (30°C))
State
Oregon
Coordinates
42.1780, -121.8010

What this number is, and is not

70°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

Hardboard Spring was recorded at 70°F (21°C), which classifies as Cool (below 86°F (30°C)). Tepid water, well below body temperature — more a cool dip than a warm soak. 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.

Hardboard Spring is in Oregon at approximately 42.1780, -121.8010. The nearest graded lake is Fremont Bridge Lake, about 4.2 miles away. Coordinates come from the USGS/NOAA inventory and locate the vent, not a trailhead or parking area.

All Oregon 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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