Whitewater Rafting in the National Parks

Fifteen Park Service units list whitewater rafting, and the list contains both ends of the sport. At one end: the Colorado River through the Grand Canyon, the most coveted river trip on Earth, where the private-permit lottery draws tens of thousands of applications for a few hundred launch dates. At the other: the Gauley, a West Virginia dam-release river that runs exactly six weekends a year and fills them with 60,000 boaters. In between are desert canyon floats, guided half-days outside Glacier, and a scattering of Alaska rivers where the whitewater is the easy part and the bush plane is the crux.

The best whitewater parks, in order of fame

01Grand Canyon
The trip. Two hundred twenty-six miles of Colorado River through the biggest canyon on the continent, rapids that reach the top of the canyon's own one-to-ten rating scale - Lava Falls and Crystal are the famous big numbers, Hermit close behind - and walls that close to a slot of sky. Note the scale: Grand Canyon rapids are rated 1 to 10, not on the international Class I-VI scale used elsewhere on this page; a canyon 10 is the park's way of saying its biggest water. Two ways in. The commercial route: roughly a dozen authorized concessionaires run oar, paddle and motor trips from three days to three weeks, and the popular ones book out a year or more in advance. The private route: a weighted lottery on the Park Service's own site, drawn each February for launch dates the following calendar year - 478 permits were offered in the lottery that opened February 2, 2026, for 2027 dates - with follow-up lotteries for cancellations. One rule binds both: a person may take only one recreational river trip per year, commercial or private. Technical whitewater experience is mandatory on private trips; the Park Service means it.
Grand Canyon fees, hours and alerts
02New River Gorge
The most accessible serious whitewater in the East, and the anchor of the national park that grew up around it. The Lower New is a four-to-five-hour run of Class III-IV rapids - harder at high water - through a thousand-foot gorge, with the famous bridge overhead at the take-out; the Upper New is the family float, mild enough for first-timers and six-year-olds. A dozen or more outfitters work out of Fayetteville, running trips from spring through fall - no permits, no lottery, just book a seat. Fall adds Bridge Day in October, when the gorge fills with BASE jumpers and the rafting keeps running below.
New River Gorge fees, hours and alerts
03Gauley River
The specialist's river, and a scheduled event: the Army Corps of Engineers drains Summersville Lake on a published calendar, and Gauley Season runs the first weekend after Labor Day and the five weekends after it - six weekends, that is the year. What the releases feed is 25 miles of river dropping more than 668 feet through 100-plus named rapids, among the best whitewater runs in the world. The Upper Gauley is the expert section, Class III to V+, with a minimum age of 16 at most outfitters; the Lower Gauley, Class III to V, takes ages 12 and up. Roughly 60,000 boaters show up for the six weekends, so trips and campsites sell out - book by midsummer, and check the Corps' release schedule before planning around a specific date.
Gauley River fees, hours and alerts
04Dinosaur: the Green and the Yampa
Two classic canyon rivers meet at Echo Park, and both run through the monument's permit system. The Green through the Gates of Lodore is the four-day trip; the Yampa, the last major undammed river in the Colorado system, is the five-day - and the prize, because its season is set by snowmelt and ends whenever the runoff says so, sometimes by late May. Both are Class III with one famous spike: Warm Springs on the Yampa, rated Class IV. Private permits run through Recreation.gov: a $15 application, a December 1 to January 31 lottery for the high-use season, then a $185 multiday permit fee for winners ($20 for the single-day Split Mountain section). Commercial outfitters run the same rivers for those who'd rather buy a seat than win one.
Dinosaur fees, hours and alerts
05Glacier: the Flathead forks
The only rafting on this list you can decide on at breakfast. Several companies run guided trips on the Middle Fork and North Fork of the Flathead along the park's boundary - half-day and full-day floats, Class II to III water with the Going-to-the-Sun country rising on both sides, no NPS permit needed because the outfitters work under Forest Service permits. It is scenery-first whitewater: splashy, cold, glacial-flour blue, and family-friendly. Season runs with the melt, roughly May through September.
Glacier fees, hours and alerts
06Canyonlands: Cataract Canyon
The Colorado below Moab, flat for 46 miles and then not. Cataract Canyon stacks 26 rapids into its final 14 miles - Big Drops, Mile Long, Little Niagara - running Class III to IV most summers and pushing into Class V territory in a big runoff, usually late May and June. Outfitted trips launch from Moab and take three to six days, ending under the spires of the Maze; private trips reserve a Canyonlands river permit on Recreation.gov - no lottery, just a calendar: reservations open four months ahead of each season (December 14 for April 14-October 15 launches, June 15 for the winter season) and close two days before launch, with no daily launch limits, a 40-person group cap, and a $36 reservation fee plus $25 per person for Cataract overnights. Low water in late summer mellows everything but the heat.
Canyonlands fees, hours and alerts

Also on the list
Redwood borders the Smith River, California's great undammed river, with Class III to IV runs through redwood-lined canyons each spring. Gates of the Arctic holds the headwaters of six Wild and Scenic rivers - the Noatak, the Alatna, the John - where the float is weeks long and the put-in is a gravel bar behind a bush plane. Alagnak Wild River mixes Class I to III water with the world's best salmon fishing, Aniakchak is expert-only packrafting off a volcano, and Yukon-Charley's river is the Yukon itself: big, fast and cold. Upper Delaware is the tame end, Class I to II riffles better suited to tubing. And three listings look like data quirks rather than whitewater parks - Chattahoochee's urban float, Glacier Bay's paddling fjords, and the Captain John Smith water trail - so we note them rather than invent rapids.

A note on rapid ratings

Two scales show up on park rivers, and mixing them up misleads. Most American rivers use the international Class I-VI scale - that's what the New, the Gauley, the Yampa and Cataract entries above use. Grand Canyon rates its rapids on its own 1-to-10 scale, where Lava Falls and Crystal sit at the top; a "10" there is not a "Class V" here, and the park's river pages are the authority. Boundary note: the Glacier entry's Flathead trips run along the park boundary under Forest Service permits, and Redwood's Smith River runs mostly outside the park on Forest Service land - both are noted in place rather than claimed as in-park whitewater.

How to get on a park river

Decide: guided or private. Guided trips need nothing but money and advance booking - a year out for the Grand Canyon, a summer out for the Gauley. Private trips need permits, and the systems differ by river: the Grand Canyon and Dinosaur run lotteries, while Cataract is a straight reservation - no lottery - with a four-month booking window on Recreation.gov. The reservation systems guide covers how the parks' booking machinery works in general; river permits are their own universe on Recreation.gov.

Match the river to the crew. Family with kids: Upper New River, Middle Fork Flathead, Upper Delaware. Solid intermediates: Lower New, Split Mountain, lower Gauley. Experts only: Upper Gauley, high-water Cataract, Lava Falls.

Watch the water calendar. Rivers run on schedules - dam releases on the Gauley, snowmelt on the Yampa and the Smith, the lottery and the four-month windows on the Colorado. The trip starts with the calendar, not the gear.