Below the town of Kremmling the Colorado cuts through the spectacular Gore Canyon, dropping dramatically some 50 river miles until it meets the Eagle river at Dotsero. It's best to float the lower end of Gore Canyon, as there are seven good drift sections from Pump house to Dotsero. But this is not easy water to negotiate. Get a qualified guide if you want to drift the canyon.
If you want seclusion, try the water up in the canyon above Pump house, which is often neglected. It's a tough trail and should be considered only by the young at heart. The payoff, however, is pristine water that changes character around every bend.
A drawback to this middle section is during spring runoff when siltation from aptly named muddy creek makes the fishing spotty. A new dam on this creek may eliminate some of the problem. Also, June - August lots of rafters take this trip and add to the crowd.
This section of the Colorado has Brown and Rainbow trout, Colorado River and whitefish. With over 50 miles of scenic river and relatively light fishing pressure, this section of the Colorado River is truly an undiscovered gem.
May through November
(NOTE: Generally, anytime before or after Spring run-off is good. July - October offers the best fly fishing. Cloudy days bring out the better fish. The middle part of the Colorado River, in slow sections, freezes over December to Early March)