Lost Creek is well named: you'd never expect to find such an unsullied pocket of scenery tucked away just a few road miles from the Superfund expanses surrounding the communities of Anaconda and Opportunity.
Still, here it is, about 500 acres of narrow valley floor threading beneath 1,200-foot limestone cliffs and domes of crackling granite, culminating with Lost Creek's 50-foot tumble over Lost Creek Falls, a shaded cataract just a short walk from the parking lot at the access road's head. Mountain goats and bighorn sheep populate the park, along with some 20 species of bird and another 20 of mammals.
Lost Creek is a primitive (i.e. low-service, no-fee) park, open seasonally from May 1 through November 30. Vault toilets and potable water pumps are available on-site, along with 25 tent and RV campsites (no hook-ups; max. length 23 feet) with tables, grills, and fire rings.