Mill Creek Crystal Cave: Big Birds on the East Fork March 5, 2023February 12, 2023 This content is for NRMG members only.Log In Register Related posts: Silvertip Mountain 2020 Trip Report Lost Creek Siphon: The Carl Froslie Experience My Trip to the Silvertip Mountain Cave System: 2019 Reaching Volehalla (And Other Arctic Caves) Searching for Caves in the Northern Rocky Mountains Big Horn Canyon: Gravity Cracks That Turn Into Caves