Hells Canyon is the deepest river canyon in the United States. Now scientists have solved the mystery of when it formed.

Hells Canyon might be deeper than the Grand Canyon, but it's barely 2 million years old, according to a new study.

Everything’s bigger in the US, they say, and that apparently includes its river gorges. But don't be fooled by its grand size ...

The son of daredevil Evel Knievel wants to follow in his late father's footsteps and attempt to jump the Snake River Canyon in southern Idaho, a spokesman for Robbie Knievel says. Jeff Lowe said ...

And yet, the Grand Canyon remains yoked to the present in one key respect. The Colorado River, whose wild energy incised the canyon over millions of years, is in crisis. As the planet warms ...

After you've admired the Grand Canyon from the hiking trails (or even from the air on a helicopter tour), enjoy a new vantage point on a Colorado River rafting tour. Options range from the family ...

The area is generally very safe in daylight hours. Very few tourists visit before sunrise. Instead, there are people like ...

Federal charges that were brought against the president of the local chapter of the Hells Angels in a high-profile racketeering case that targeted motorcycle gangs across Arizona have been dismissed.