[2] The hot springs were used for centuries by local indigenous people for their warmth and healing properties.

[4] The hot mineral water emerges from the ground at 194 °F / 90 °C[5] through a series of seeps that flows down a hillside, cooling as it enters several primitive, rock and boulder-lined soaking pools.

Several seeps along the creekside emerge at cooler temperatures than the main springs.

[6] Willett Hot Springs are also located in the Sespe Wilderness area.

[8] The hot mineral water flows from at least four spring clusters on a bank above Sespe Creek, a source on the steep slope, and from seeps in the stream bed gravel.