Paddling in Colorado

The Arkansas River does most of the talking here.

The 148-mile Arkansas Headwaters Recreation Area corridor runs from Leadville to Pueblo Reservoir, dropping roughly 4,650 feet in 125 miles and packing in everything from Class I water below Cañon City to the Class V–VI Pine Creek Rapid below Granite.

The Numbers, named before the 1964 National Slalom Championships, gets called the best Class IV run in the state by American Whitewater. Browns Canyon National Monument sits just downstream as the busiest commercial Class III–IV stretch.

Then the Royal Gorge — Class IV–V against 1,000-foot granite walls with essentially no portage or escape once you commit.

Salida and Buena Vista both built whitewater parks into their downtowns, and FIBArk has run in Salida since June 1949, making it the continent's oldest whitewater festival. The ACA- and ICA-sanctioned slalom there dates to 1953–54.

Outside the Arkansas, the signature runs each have their own rhythm. Gore Canyon on the upper Colorado near Kremmling is the state's reliable mid-summer Class V, running 800–1,300 cfs from mid-July through mid-October — Kirshbaum at mile 6.

7 is too long to portage, so entering the canyon means running it.

The Roaring Fork's Slaughterhouse section near Aspen is entirely undammed, shifting from technical Class IV at 450–1,600 cfs to Class V above 2,200, with outfitters like Thunder River Adventures checking the USGS Aspen gauge every morning.

The Cache la Poudre, Colorado's only National Wild and Scenic River since 1986, holds Class III–V water including the Upper Narrows trio — Super Collider, Cabbage Shredder, Whiteline — through July.

Clear Creek west of Denver provides expert Class IV within I-70 commuting distance. The upper Animas, out of Durango, runs among the toughest commercially rafted water in the country. Flatwater means high-altitude reservoirs: Dillon in Summit County with 26.

8 miles of shoreline, Blue Mesa outside Gunnison at 96 miles, plus Grand Lake, Horsetooth, and others. Water stays near 60°F at Dillon, swimming is prohibited, and ANS inspections are mandatory before launch.

Manually propelled craft don't register with CPW, but every boat needs owner name and address, a PFD per person, and — at 16 feet or longer — a Type IV throwable.

Clubs anchor the culture: Colorado Whitewater in Denver, Pikes Peak Whitewater Club in Colorado Springs since 1975, the Roaring Fork Kayaking Club in Carbondale, and Fort Collins-based Colorado River School. Everyone watches the gauges.

The river does what the mountains tell it to do.