Grand Canyon's Colorado River runs 277 miles through the canyon from Lees Ferry. Inside it sits Crystal Rapid, rated 8 out of 10 on the canyon's own danger scale. A 1966 flash flood dumped rock into the river there. The park's swiftwater rescue team does not avoid that water. In one drill, they flipped a raft on purpose in Crystal Rapid, then raced the current to right it. They still train in it several times a year.
Rangers Flip a Raft on Purpose in the Grand Canyon
The Colorado River drops through Grand Canyon for 277 miles, and one short stretch of it scares boatmen more than any other. At Crystal Rapid, a team of National Park Service swiftwater rescuers flips a raft over on purpose. Then they race the current to flip it back.
A 277-Mile Ribbon of Whitewater
Grand Canyon National Park's boatable river corridor stretches 277 miles from Lees Ferry.
Every mile of it is free-flowing whitewater, with no dams and no easy exits once a trip is underway.
Around river mile 98 sits Crystal Rapid, part of a violent run of drops that river guides call "the gems."
The Rapid a Flood Built
Crystal Rapid was not always this rough. In 1966, a flash flood tore through Crystal Canyon and dumped a wall of rock and debris straight into the main channel.
Overnight, the river gained a new obstacle course. Crystal Rapid now rates an 8 out of 10 on the canyon's own difficulty scale, making it one of the hardest stretches on the entire river.
Flipping the Raft on Purpose
In April 2022, a Grand Canyon swiftwater rescue team used that same rough water to run a drill.
They swamped a raft in Crystal Rapid, then worked together to muscle the hull back upright against the current.
An NPS photographer, A. Sherman, caught the crew mid-flip, a rare look at training most park visitors never see from the rim.
A Team That Trains for the Worst
The crew that ran this drill is the same one that would answer a real capsize anywhere along that 277-mile stretch of river.
Crystal Rapid does not wait for calm conditions, so neither do they.
Asked about the drill, Grand Canyon National Park's Public Affairs Office told FunFactz that swiftwater rescue training for park staff "takes place multiple times throughout the year, including at Lees Ferry and at various rapids along the Colorado River," and that "training is not limited to a single river season." The park says the crew is "generally referred to as the park's river patrol staff or river rangers, depending on the context."
Frequently Asked Questions
How long is the Colorado River through Grand Canyon National Park?
How dangerous is Crystal Rapid?
How did Crystal Rapid become so difficult?
Why do National Park Service rescue teams flip a raft on purpose?
Can visitors raft through Crystal Rapid?
Verified Fact
Verified Sep 5, 2026 · 4 sources checked
Source: National Park Service (Grand Canyon NPS)Show verification details
Claims checked
- Grand Canyon's boatable river corridor runs about 277 miles from Lees Ferry
- Crystal Rapid rates 8 out of 10 on the canyon's own 1 to 10 difficulty scale
- Crystal Rapid was created by a 1966 flash flood that dumped rock and debris into the river
- The photo shows a National Park Service swiftwater rescue team righting a flipped raft at Crystal Rapid during an April 2022 training exercise
- Team described as "river rangers" corrected to "the park's swiftwater rescue team," matching the NPS photo caption
- The 277-mile river length was decoupled from an unconfirmed pairing with the Pearce Ferry mile marker
- Swiftwater rescue training is ongoing, several times a year, at Lees Ferry and at rapids along the river; the crew is the park's river patrol staff, also called river rangers
Sources: National Park Service, Wikipedia, Flickr (NPS Photo/A. Sherman)
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