Book celebrates 50th anniversary of Hells Canyon National Recreation Area ENTERPRISE — It’s Oregon’s manual of facts and figures and highlights of some of the state’s special places.

The Hells Canyon Scenic Byway on the Oregon-Idaho border takes you to the top of the deepest gorge in the U.S.

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

Hells Canyon borders Oregon, Idaho and Washington. It's cut through by the Snake River and is North America's deepest river gorge, at 10 miles (16 kilometers) wide and about 1.5 miles (2.4 km ...

About 2,000 feet deeper than the Grand Canyon, Hells Canyon was rapidly carved when a lake spilled over about 2.1 million years ago, new research estimates.

Hells Canyon, the deepest river gorge in the United States, was carved just about 2.1 million years ago — making it much younger than the Grand Canyon.

Hells Canyon, which is on the border between Oregon and Idaho, is almost 8,000 feet deep. That makes it far deeper than the famous Grand Canyon of Arizona, which reaches a depth of about 6,000 ...

Hells Canyon, the deepest river gorge in the United States, was carved just about 2.1 million years ago — making it much younger than the Grand Canyon.

Hells Canyon, which is on the border between Oregon and Idaho, is almost 8,000 feet deep.

Hells Canyon, the deepest river gorge in the United States, likely got rapidly carved 2.1 million years ago when a shifting landscape in Idaho caused a giant lake to start overflowing.