Possibly The Highest Cave In Montana December 20, 2018August 4, 2016 This content is for NRMG members only.Log In Register Related posts: Searching for Caves in the Northern Rocky Mountains Which Cave Mountain Cave Are We Talking About? Royce Cave: Rough Road To Royce Sluice, Logjam, and Yakinikak: One way to beat the heat Checkerboard Cave: Getting Muddy in Checkerboard Montana’s Highest Cave