- Waterproof - Tear-Resistant - Fishing & River Map The Colorado River, Kremmling to Glenwood Springs Fishing & River Map Guide is designed to be the perfect companion for anyone recreating on this section of the mighty Colorado River. With a route length of approximately 94 miles and a vertical drop of nearly 1,500 feet, the section of the Upper Colorado River depicted on this map—from Kremmling to Glenwood Springs—flows through diverse landscapes. The river passes through Gore Canyon, Radium State Wildlife Area, and Glenwood Canyon, supporting a variety of ecosystems as it transforms into a powerful, mighty waterway known for its prolific insect life, quality brown and rainbow trout and mountain whitefish (with the occasional native cutthroat trout), wildlife viewing opportunities, and superb cultural and historical features. The Colorado River in this section begins with Class V+ rapids just below Kremmling in Gore Canyon. After flowing through Gore Canyon, the river passes State Bridge.