Ainsworth Hot Springs Resort is at 3609 Hwy. 31. Overlooking Kootenay Lake, the springs feature a natural, odorless mineral cave pool with an average temperature of 40-44 C (104-111 F), and a main pool averaging 35 C (97 F). The cold plunge pool, fed by a natural spring, has an average temperature of 4 C (40 F). Towels can be rented.