Alvord Hot Springs Bath House & Campground, Steens Mountain

Alvord Hot Springs is a family-run fee soak at the east base of Steens Mountain on the edge of the Alvord Desert playa, addressed at 36095 East Steens Road near Princeton in Harney County, Oregon. The Davis family hosts twin concrete pools dating to the 1940s, with on-site caretakers, a small store and reception, restrooms, bunkhouses, and campsites. Water leaves the ground near 170°F and cools as it mixes into the soaking pools. Overnight guests may use the pools at any hour; day-use visitors are welcome during normal business hours, and the homepage asks day-use soakers to call ahead for availability. East Steens (Fields–Denio) Road is mostly unpaved gravel; the operator recommends calling (541) 589-2282 for road conditions. RV guests are welcome without hookups. Bunkhouses sleep up to four, include beds, an outlet, light and heat (bring your own linens), list children 12 and under as free, and include soaking with the stay. A private lakebed access road is offered with reservations for guests who want an easier path onto the playa than the public approaches.

Source: alvordhotsprings.com

In Princeton, Oregon, Alvord Hot Springs Bath House & Campground is a short way off Fields-Folly Farm Road — under a quarter mile. Vehicle clearance on file is High Clearance for this resort or spa (on the operator's own site). Sources on file put the water around 170°F (scalding). The listed price band is $$$, camping on site is confirmed on the operator's own site and facilities noted here: lodging on-site, restrooms and food on-site. No verified note on whether clothing is required, optional, or banned.