Primitive vs. developed hot springs
The phrase 'hot spring' covers everything from a mud-rimmed pool at the end of a six-mile trail to a tiled resort with a locker room. Neither is better — but showing up expecting the other one ruins the day.
Primitive springs
A primitive spring is nature plus whatever visitors have stacked up — usually a rock-and-sand pool, sometimes a scavenged tub. Nobody manages the temperature, tests the water, or maintains the trail. That's the appeal: solitude, scenery, and a soak that feels earned.
The trade-offs are real. Temperatures swing with season and flow, algae and silt are part of the deal, and etiquette is self-enforced — which sometimes means nudity, sometimes means broken glass from careless visitors before you. Pack out everything, including things others left.
Developed springs
Developed springs pipe the same geothermal water into managed pools — resorts, campgrounds, or simple concrete tubs with a fee box. You get reliable temperatures, posted rules, parking, and usually a restroom. You give up wildness and pay admission.
They're the right call for kids, first-timers, winter trips when backroads close, and anyone who wants a guaranteed soak rather than a gamble.
Reading a listing before you commit
Check the access notes and recent conditions reports on a spring's page, and look at the surrounding map — a spring miles from any road is primitive by definition, while one beside a highway with a name like 'Resort' tells you what to expect. When in doubt, search the spring's name plus your travel month before driving out.