Possession and slot limits were instituted when the rainbows were introduced, and the brown population thrives. They average from 12 to 14 inches and larger fish are common. Special regulations apply from the Rio Grande Fisherman Access Area to Marshall Park Campgrounds and from Willow Creek to Goose Creek. Angling is restricted to flies and lures only. The browns must be 12 inches or shorter.
Timing is important here.
The river can be floated only during the high flows associated with runoff. However, during early runoff, from May to mid-June water temperatures are too cold for insect activity and angling is poor. Warming temperatures in mid-June stimulate insect activity, and thus trout feeding. By August, low flows make floating impossible. In recognition of the fine habitat, abundant food supply and versatile angling potential, the section of the Rio Grande between South Fork and Del Norte has been designated by the Colorado Division of Wildlife as Gold Medal Water. . .