Terry Gunn & Wendy Gunn 
Fly Fishing the Colorado River at Lees Ferry [EPUB ebook] 

Written by an expert outfitter with boots in its waters, this piece includes a detailed map with access points along the river, information about gear, seasonal hatches, local lodges, fly shops, restaurants, watering holes, and closest medical care, along with the sort of intimate, insider information only someone working on the river can share.