Discover a Trout Stream Hidden in Plain SightColorado’s Arkansas River is home to one of the busiest sections of whitewater in the country. But after 5 p.m. each summer day, swarms of rafters vamoose for Salida’s bars, leaving the river in utter quietude—an angler’s paradise. Twenty years ago, the Arkansas was grossly contaminated with heavy metals leaching from old mines and smelting sites upstream. Major cleanup efforts, including a new water treatment system, have transformed it into a phenomenal fishery with naturally reproducing populations of brown and rainbow trout. Join Arkansas River Tours’ evening fly-fishing trips, which launch at five in the afternoon and end after sunset between April and September ($175 for two; arkansasrivertours.com). During those months, over 40 species of caddis hatch, piquing the interest of 16-inch browns.