2 listings
Most Mineral-Rich Hot Springs in Oregon
Springs whose source water tested at 1,500 mg/L or more of dissolved minerals, based on USGS and state lab samples. For comparison, tap water is usually under 500 mg/L.
We list 2 in Oregon: the hottest is Breitenbush Hot Springs (up to 110°F) and the lowest listed adult price is Belknap Hot Springs Lodge & Gardens ($12).

Belknap Hot Springs Lodge & Gardens
A lodge on the McKenzie River with two hot spring soaking pools, gardens, cabins and tent and RV sites. Walk-in visitors pay $12 for one hour in the lower pool; the upper pool is reserved for overnight guests. Children under 5 are not allowed in the pool area.

Breitenbush Hot Springs
An off-grid retreat center in the Willamette National Forest east of Detroit, with meadow pools, spiral tubs and a sauna fed by hot springs. Day passes run 9am to 6pm and often sell out weeks ahead; overnight guests get meals and 24-hour soaking. The property is substance-free, fragrance-free and has no cell service.