Terwilliger Hot Springs Oregon
- Location
- Blue River, United States
- Water type
- sodium chloride
- Temperature
- 46 °C
- pH
- 7
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
In the western Cascades of Oregon, near the town of Blue River, Terwilliger Hot Springs — locally known as Cougar Hot Springs — sits within the Willamette National Forest at the edge of a temperate rainforest of moss-draped bigleaf maples and towering Douglas firs. A short forest trail leads to a cascade of natural rock pools descending a hillside, each pool slightly cooler than the one above, creating a gradient of temperatures that bathers move between as the afternoon unfolds.
Sodium-chloride water surfaces at a vigorous 46 °C at the source, cooling progressively through the series of natural pools. The neutral pH of 7.0 makes for a balanced, uncomplicated soak. The site has been a gathering place for Oregon's outdoor communities for decades, carrying a distinctly Pacific Northwest sensibility — informal, attentive to the surrounding forest ecosystem, and deeply shaped by the experience of reaching it on foot through the deep green of the Cascades.