Cottonwood pass is a paved road and any car can make it to this trailhead. The valley is protected to the west by the spectacular collegiate peaks, which are colorado's highest mountains. Ptarmigan Lake Trail Camping Spots Trail Lake Road & route closed in winter. Lost lake colorado buena vista . However, it to can be hard to find. With many streams and high mountain lakes, the buena vista area. Tidbits 2.6 miles out and back rated: It is a mere one mile hike (one way) to the lake, with a trail that begins at chaffee county road 306. Use a bear canister and keep it 200 feet from campsite. Hiking lake views wildflowers wildlife rocky. From the stoplight in downtown buena vista, co (hwy 24 & main st), go west on main st (chaffee cr 306) for 18.1 miles. Published with permission from the guide book: Flies i have had success with at this lake include hopper patterns, ants, stimulators, and griffiths gnat. This may be my favorite lost lake in color...