Historic sulfur warm springs in Spanish Fork Canyon at the vanished Castilla resort site beside US-6/89. Train-era spa destination of the 1890s–early 1900s; the resort burned in 1942 and was never rebuilt. Today the springs form a roadside sulfurous seep/wetland rather than developed soaking pools — visit as a geothermal historic landscape, not a spa day.
Field facts
| Region | Utah County, UT |
|---|---|
| Coordinates | 40.0371, -111.5291 |
| County | Utah |
| Era | Resort heyday c. 1890s–1942 |
| Character | Sulfur warm springs / seep wetland |
| Setting | Spanish Fork Canyon, US-6 corridor |
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