Lost Trail Hot Springs Resort

Just below Lost Trail Pass at the top of the Bitterroot Valley, this resort has a 20 by 70 foot spring-fed pool averaging 95 degrees, with a 9-foot deep end that shallows to a 10-inch wading section for small children. Add a hot tub at 103-105 and a dry sauna; in winter a dome goes over the pool. The catch is the hours. It opens three or four days a week depending on season, Friday through Sunday for most of the year, so call before you drive. Bring cash, since adults pay $10 and cards add 3 percent. The lodges are named for Sacajawea and Meriwether Lewis.