Know Before You Go
Coming from the North, look for the extra wide shoulder on the east side of the highway (2 lane) near mile marker 55. There are no signs, but you've missed it if you pass mile marker 55.
Park on the shoulder of the highway and hike down a steep hill to the river. There are no signs, and unless young know just where to look you might miss them, but in a ditch at the bottom of the hill is Penny Hot Springs.
Spring is a poor time to visit as the snow cold runoff overwhelms the heat of the springs, but the rest of the year is very wonderful for visits. These hot springs are bare bones and completely natural, with no facilities beyond what nature provides.