Keough's Hot Springs, 8 miles south of Bishop, has a swimming pool at @ 80+F, and a small pool at @ 100+F. Modest fee to use the facility. Fed by a natural hot spring. It is a clean, well maintained facility.
http://www.keoughshotsprings.com/The water flows out of Keoughs' into the so-called "hot ditch," but I can't advise using that - it is not clean.
