Written for both through-hikers of the entire 471-mile Colorado Trail and segment-hikers doing a section at a time, this guide has everything you detailed descriptions of every mile, resupply information at nearby towns, equipment recommendations, food and safety considerations, wilderness etiquette, natural history, and much more. Accurate mileage charts, tips from the experts, GPS waypoints, a detailed index, high-quality photographs, and must-have elevation profiles make this the most complete and accurate book available on the Colorado Trail.
This won't tell you everything you need to know about the CT, but it's the first stop for forging a plan. The book opens with a tribute to Gudy Gaskill, "The Mother of the Colorado Trail," followed by several informative chapters on the CT Foundation, logistics for hiking the CT, history of Colorado in the CT regions, flora, fauna, and geology of the CT. The bulk of the book provides a section-by-section overview, including important statistics, trailhead directions and parking, water and resupply locations, and points of interest. It contains helpful links and bibliography to other resources. The volume is 26.8 ounces (762 g), for those counting.
I wish I had known prior to buying this guide that it wouldn't have the most up to date water information. Besides that, it was really useful while I hiked the Colorado Trail! However, we were the only ones on the trail using this guide. Most people just used Guthook, an app that doesn't weigh anything.
As of now, the eighth edition is the latest. Full of essential and ancillary notes of interest for anyone wanting to hike/bike the CT, either in segments or as a through hike. August, 2014.