When the time comes for Eldora to grow outside its current boundaries, the ski area will stretch its alpine and nordic trails south, preserving Middle Boulder Creek and the Hessie-Lost Lake area to the north. The latest expansion plans are a culmination of two years of discussions between the resort and neighbors and environmentalists upset by a proposal that encroached on the Middle Boulder Creek watershed. Eldora is entering into a formal agreement with Boulder County, the Sierra Club and the Middle Boulder Creek Coalition that will guide future development and preservation of the neighboring wilderness areas.