Straddling the Continental divide along the Wind River ridge, Wyoming has some of the best trout habitat in the United States. It is also home to most of Yellowstone National Park. What Shenandoah National Park is for Brook Trout anglers, Yellowstone is for cutthroat fishermen: one of the best places to find high quality native trout fishing. Four native cutthroat variants can be caught in Wyoming: Bonneville, Colorado River, Westslope, and Yellowstone, mostly in headwaters reaches of smaller streams.
Because of Endangered Species Act reporting (and funding) Native trout populations in Wyoming are well documented. The state wildlife agency is not particularly forthcoming; however, we did find a source for mapping Wyoming's classified trout streams (categorized blue, red, yellow, green, trout biomass), which we hand digitized and have provided here.